How to Rewind a Weed Eater String? Quick String Rewind Method

Introduction

A tangled or broken weed eater string can bring your yard work to a complete standstill, especially if you’re in the middle of a big project like edging your lawn or clearing overgrown weeds. Many people assume they need to buy a whole new weed eater head when their string runs out, but that’s not the case. Learning how to rewind a weed eater string is a simple, 10-minute task that saves you money and gets you back to work fast. Most modern weed eaters are designed with user-replaceable spools, so you don’t need any special tools or mechanical experience to do the job correctly.

If you’ve been searching for how to rewind a weed eater string? you’ll find all the information you need below, including step-by-step instructions for every common head type, tips to make your string last longer, and answers to frequently asked questions. This guide covers everything from identifying your head type to avoiding common tangles, so you can handle this routine maintenance task yourself with confidence, no professional help required.

• Why Weed Eater String Gets Tangled
• Types of Weed Eater Heads
• Tools You Need to Rewind a Weed Eater String
• General Step-by-Step to Rewind a Weed Eater String
• How to Rewind a Bump Feed Weed Eater String
• How to Rewind an Automatic Feed Weed Eater String
• Comparison of Common Weed Eater Head Types
• Tips for Extending Your Weed Eater String Life
• Common Mistakes to Avoid When Rewinding String
• When to Replace Your Weed Eater Head Instead of Rewinding
• Frequently Asked Questions
• Conclusion

Why Weed Eater String Gets Tangled

Understanding why weed eater string tangles in the first place will help you prevent the problem in the future, and make rewinding much easier. The most common causes of tangled string include:

• Over-winding the spool: When you wind too much string onto the spool, it bunches up inside the head and knots as it feeds out. Most spools are designed to hold a specific length of string, and overfilling them is the number one cause of tangles.
• Using the wrong string diameter: If the string is too thick for your head, it won’t feed properly through the exit hole and will catch on the spool, causing it to knot up. String that’s too thin will wear down too quickly and can also tangle if it frays.
• Debris in the head: Grass, dirt, small twigs, and old string remnants can get caught in the spool housing, causing the new string to catch and tangle as it feeds. Failing to clean the head before installing a new spool is a common oversight that leads to avoidable tangles.
• Winding the string in the wrong direction: Nearly all weed eater spools are designed to unwind in a specific direction, marked with a small arrow on the spool itself. Winding the string backwards will cause it to tangle immediately as soon as you start the tool.
• Not securing the string end: If the loose end of the string isn’t tucked into the small notch on the edge of the spool, it will unravel as soon as the tool starts running, leading to a tangled mess inside the head.
• Letting the string get too short: When the string wears down to less than 2 inches, it can’t feed properly through the head, and will often catch on the spool and knot up. Rewinding your string when it’s still 3-4 inches long will prevent this issue.

Types of Weed Eater Heads

The process for how to rewind a weed eater string varies slightly depending on the type of head your tool uses, so it’s important to identify yours before you start. There are three main types of weed eater heads on the market today:

Bump Feed Heads

Bump feed heads are the most common type, found on most residential weed eaters. They have a spool of string housed in the bottom of the head, and you advance the string by bumping the head firmly against the ground while the tool is running. Each bump releases a small increment of string, usually ¼ to ½ inch. They’re affordable, easy to maintain, and ideal for casual homeowners who trim their lawns regularly.

Automatic Feed Heads

Automatic feed heads advance the string automatically as you work, without needing to bump the head against the ground. They use a small gear mechanism that senses when the string is worn down and feeds out more as needed. These heads are common on higher-end residential and commercial weed eaters, and are designed for users who trim large areas regularly and don’t want to stop to bump the head for more string.

Fixed Line Heads

Fixed line heads use a single, pre-cut piece of string that is threaded through the head and secured with a small screw or clip. They don’t have a traditional spool, so “rewinding” usually means replacing the entire piece of string rather than winding a new spool. They’re the most durable option, popular for heavy-duty work like cutting through thick brush, weeds, and small woody vegetation.

Tools You Need to Rewind a Weed Eater String

You don’t need any specialized tools to rewind a weed eater string, and most of the items you’ll need are already in your garage. Here’s what to gather before you start:

• Replacement weed eater string: Make sure it matches the diameter recommended by your tool’s manufacturer. Common sizes are 0.065” for light-duty residential use, 0.080” for general-purpose trimming, and 0.095” or thicker for heavy-duty jobs. Check your tool’s manual or the label near the head for the correct size.
• Sharp scissors or string cutter: To cut the string to the correct length after winding.
• Work gloves: To protect your hands from sharp string edges and any debris in the head, especially if you’re using thicker, heavier string.
• Flathead screwdriver (optional): Some heads require this to release the spool or remove the retaining clip that holds the head to the weed eater shaft.
• Small cleaning brush (optional): An old toothbrush or small wire brush works well to remove grass and debris from the head before installing new string.

It’s a good idea to buy a little extra string to keep on hand, so you can rewind your head whenever you need to without making a trip to the store. Most hardware stores sell replacement string in bulk rolls for a few dollars, which will last you for years of regular use.

General Step-by-Step to Rewind a Weed Eater String

This general process applies to most spool-style bump feed and automatic feed heads. If you have a fixed line head, skip to the section below for specific instructions for that type.

1. Disconnect the power source: For gas-powered weed eaters, turn off the engine and let it cool completely before touching the head, as the muffler and engine can stay hot for several minutes after shutdown. For corded electric models, unplug the tool from the outlet. For battery-powered models, remove the battery pack entirely to avoid accidental startup while you’re working.
2. Remove the weed eater head: Most heads twist off counterclockwise, but check your tool’s manual if you’re unsure. Some models have a retaining nut that you’ll need to loosen with a screwdriver before twisting the head off. Don’t force the head if it won’t twist, as this can damage the threads on the weed eater shaft.
3. Clean out the head: Use your small brush or a dry cloth to remove any grass, dirt, or tangled string remnants from the spool housing. Pay special attention to the small feed hole where the string exits the head, as this is where debris is most likely to get stuck. Use a toothpick or small screwdriver to dislodge any stuck material if needed.
4. Remove the old spool: If your head uses a removable spool, release the retaining clip or twist the spool housing to free it from the head. Take note of how the old string was wound before removing it, as this will guide your rewinding. If your spool is not removable, you may be able to rewind the string directly on the head without removing it, depending on your model—check your tool’s manual for specific instructions.
5. Wind the new string onto the spool: Follow the direction arrow printed on the spool (most spools have a small molded arrow showing the correct winding direction). Wind the string evenly, overlapping each layer by about ¼ inch to avoid gaps, and leave 6-8 inches of loose string at the end to feed through the head. Wind the string firmly but don’t stretch it tight, as over-tightening will cause feeding problems.
6. Secure the string end: Tuck the loose end of the string into the small notch on the edge of the spool to prevent it from unraveling while you install the spool back into the head. Some spools have a small clip to hold the string end in place, so use that if your spool has one.
7. Reinstall the spool and head: Slide the wound spool back into the head housing, making sure the string feeds through the correct exit hole. Secure the retaining clip or twist the spool housing back into place, then reattach the head to the weed eater body by twisting it clockwise until it’s tight. Double-check that the string is not caught on any part of the head during installation.
8. Test the feed: Reconnect the power source, turn on the weed eater, and test the string feed. For bump feed models, bump the head firmly against a hard surface 2-3 times to advance the string. For automatic feed models, let the tool run for 10-15 seconds to let the mechanism advance the string automatically. Trim any excess string with your scissors if needed, and test the feed again to make sure it works properly.

How to Rewind a Bump Feed Weed Eater String

Bump feed heads are the most common type, so this is the process most homeowners will use. The general steps above apply, but there are a few type-specific tips to keep in mind:

• If your bump feed head uses two strings instead of one, wind both strings onto the spool at the same time, keeping them parallel to each other as you wind. This prevents the strings from crossing over and tangling.
• Leave exactly 6-8 inches of loose string at the end: too little and the string won’t advance when you bump the head, too much and it will bunch up inside the head.
• After installing the head, bump it firmly against a hard surface 3-4 times while the weed eater is running to advance both strings to the correct length, which is usually 4-6 inches from the head.

If the string doesn’t advance after bumping the head, turn off the tool and check that you wound it in the correct direction and that the loose end is tucked into the spool notch. If the string still won’t feed, remove the head and make sure there’s no debris jammed in the feed hole.

How to Rewind an Automatic Feed Weed Eater String

Automatic feed heads have a slightly different process, as they use a small gear mechanism to advance the string automatically. Follow the general steps above, plus these type-specific guidelines:

• When winding the spool, make sure the string is aligned with the small feed notch on the spool, so the gear can grab it correctly. Misaligned string will prevent the mechanism from working.
• Don’t over-wind the spool: automatic feed mechanisms are sensitive to tension, and over-winding will cause the string to advance too quickly or jam. Wind the spool until it’s full, but no bulging at the edges.
• After installing the head, run the weed eater for 10-15 seconds to let the mechanism advance the string to the correct length automatically. Some models have a manual advance button you can press if the automatic mechanism isn’t working.

If the string doesn’t advance after running the tool, turn it off and check that the spool is seated correctly in the head. A misaligned spool will prevent the gear from grabbing the string, so make sure it’s snapped or twisted fully into place before testing again.

Comparison of Common Weed Eater Head Types

Choosing the right head type for your needs can make rewinding and maintenance much easier. Below is a comparison of the three most common head types to help you decide which is best for your yard work:

For most casual homeowners, a bump feed head is the best choice, as it’s affordable, easy to maintain, and works well for general yard trimming. If you have a large property or trim frequently, an automatic feed head will save you time by eliminating the need to bump the head for more string. For heavy-duty jobs with thick brush or rocky terrain, a fixed line head is the most durable option, as it’s less likely to break under heavy load.

Tips for Extending Your Weed Eater String Life

With proper care, you can make your weed eater string last 2-3 times longer, reducing how often you need to rewind it. Follow these tips to get the most out of your string:

• Use the correct string diameter for your tool: Check your weed eater’s manual for the recommended string size. Using a thicker string than specified will overload the motor and cause the string to break more often, while thinner string will wear down too quickly and won’t cut through thick weeds effectively.
• Don’t over-wind the spool: Wind only enough string to fill the spool without bulging. Over-winding causes the string to bunch up and tangle, and puts extra tension on the feed mechanism, leading to premature wear.
• Clean the head regularly: After each use, wipe out the head housing to remove grass, dirt, and debris. Buildup can jam the string and cause it to break or tangle, so a 30-second cleaning after each use will save you time in the long run.
• Avoid hitting hard objects: Hitting rocks, concrete, or tree stumps will wear down the string quickly and can even damage the spool or head. If you need to edge near hard surfaces, use a guard or adjust the cutting height to avoid contact.
• Store extra string in a dry place: Nylon string degrades if exposed to moisture and sunlight for long periods, becoming brittle and prone to breaking. Keep spare string in a sealed container in a cool, dry spot to extend its shelf life.
• Rewind the string in a cool, dry environment: High humidity can make nylon string stretchy, which can cause it to tangle more easily. If you’re working outside on a humid day, try to rewind the string indoors if possible.

Common Mistakes to Avoid When Rewinding String

Even experienced weed eater users make these common mistakes when rewinding string, leading to tangles, broken string, and jammed heads. Avoid these errors to make the process smoother:

• Winding the string in the wrong direction: Most spools have a small arrow printed on them showing the correct winding direction. Winding backwards will cause the string to tangle immediately as it feeds out. Always follow the arrow on your spool, even if you think you know the right direction.
• Over-tightening the string: Pulling the string too tight while winding will put extra tension on the feed mechanism and cause the string to break or not advance properly. Wind the string firmly but don’t stretch it tight; it should have a small amount of give when you pull it.
• Skipping the cleaning step: It’s tempting to just swap out the old string for new without cleaning the head, but leftover grass and debris will jam the new string and cause tangles. Always take 30 seconds to wipe out the head before installing a new spool.
• Using the wrong string size: As mentioned earlier, using string that’s too thick or too thin for your head will cause feeding problems. Always check your tool’s manual for the recommended size before buying replacement string, and don’t assume that all string fits all heads.
• Not securing the string end: Forgetting to tuck the loose end of the string into the spool notch will cause it to unravel as soon as you start the weed eater, leading to a tangled mess. Always double-check that the end is secured before reinstalling the spool.
• Using old, worn-out string: Nylon string degrades over time, especially if it’s been exposed to sunlight or moisture. Using old, brittle string will cause it to break frequently, even if you wind it correctly. Always use fresh string for best results, and replace spare string that’s been stored for more than a year.

When to Replace Your Weed Eater Head Instead of Rewinding

While rewinding is almost always cheaper than replacing the entire head, there are times when replacement is the better option. Consider replacing your head instead of rewinding if:

• The head housing is cracked or broken: If the plastic housing of the head is cracked, it won’t hold the spool securely, and rewinding won’t fix the problem. A cracked head can also be dangerous, as it may break apart while the tool is running.
• The spool is warped or damaged: If the spool itself is bent or the notches that hold it in place are broken, you won’t be able to wind string evenly, and it will keep tangling no matter how carefully you wind it.
• The feed mechanism is broken: If the string won’t advance even after rewinding correctly, the gear or spring that advances the string may be broken. Repairing these small parts is often more expensive than buying a new head, so replacement is the more cost-effective option.
• You’ve rewound the spool 5+ times: Most plastic spools are designed to be rewound 3-5 times before the plastic starts to wear out. If you’ve rewound your spool multiple times and it’s still having problems, it’s time to replace the head.

Replacement heads are widely available for most weed eater models, and they’re usually inexpensive enough that it’s not worth trying to repair a broken head. You can often buy just a replacement spool instead of the entire head, which is even cheaper—check with your tool’s manufacturer to see if replacement spools are available for your model.

Frequently Asked Questions

How often should I rewind my weed eater string?

There’s no set schedule for rewinding, as it depends on how often you use your weed eater and the type of terrain you’re trimming. For casual users who trim once a week, you’ll likely need to rewind the string every 2-4 weeks. If you’re trimming thick, woody weeds or rocky terrain, you may need to rewind it every 1-2 weeks. The best rule of thumb is to rewind the string whenever you notice it’s worn down to less than 3 inches, or if it starts tangling frequently. If you notice the string is wearing down faster than usual, you may need to rewind it more often, or check that you’re using the correct string size for your tool.

Can I use any type of string for my weed eater?

No, you should always use the string diameter recommended by your weed eater’s manufacturer. Using string that’s too thick will overload the motor and cause the string to break frequently, while string that’s too thin will wear down too quickly and won’t cut through thick weeds effectively. Most residential weed eaters use 0.065” or 0.080” string, while heavy-duty models use 0.095” or thicker. You can also use specialty string, like square or serrated string, for tougher cutting, as long as it matches the recommended diameter. Some weed eaters can also use metal string for cutting through thick brush, but you should only use this if your tool’s manual specifically says it’s compatible, as metal string can damage the head and motor if used on a model not designed for it.

Why does my weed eater string keep breaking after rewinding?

There are several common reasons for this: 1. You’re using the wrong string size for your tool. 2. You over-wound the spool, causing too much tension. 3. There’s debris jammed in the head that’s catching the string. 4. You’re hitting hard objects while trimming. 5. The spool or head is damaged and needs to be replaced. Start by checking that you’re using the correct string size and that you wound it properly, then clean out the head to remove any debris. If the problem persists, inspect the spool and head for damage. If you’ve checked all other potential causes and the string still breaks, the issue may be with the weed eater’s motor or shaft, which may need to be repaired by a professional.

Do I need to remove the weed eater head to rewind the string?

For most bump feed and automatic feed heads, yes, you’ll need to remove the head from the weed eater body to access the spool and rewind the string. Some newer models have a quick-release spool that lets you rewind the string without removing the entire head, but these are less common. If your model has a quick-release spool, you can usually rewind the string by pressing a small button on the side of the head to release the spool, then winding the new string and snapping the spool back into place. Check your tool’s manual to see if your model has this feature. Fixed line heads also require you to remove the head to replace the string.

How much string should I wind onto the spool?

Most spools are designed to hold 10-15 feet of string, depending on the diameter. Wind the string until the spool is full, but don’t overfill it: the spool should be completely covered with string, but there should be no bulging or gaps between layers. Leave 6-8 inches of loose string at the end to feed through the head, and tuck that end into the notch on the spool to secure it. If you wind too little string, you’ll have to rewind it more often, which is inconvenient. If you wind too much, it will bulge out of the spool and cause tangles. The best way to get the right amount is to wind the string until the spool is full, with no gaps between layers, and no bulging at the edges.

Conclusion

Learning how to rewind a weed eater string is one of the easiest and most cost-effective maintenance tasks you can do for your yard equipment. Instead of spending $20 or more on a replacement head every time your string runs out, you can rewind your existing spool for less than $1 in replacement string. The process only takes a few minutes, and with a little practice, you’ll be able to do it quickly without even referring to instructions.

By following the steps and tips outlined in this guide, you can avoid common tangles, make your string last longer, and keep your weed eater running smoothly all season long. The key takeaways are to always use the correct string size for your head, wind the spool in the right direction, clean the head before installing new string, and secure the string end properly to prevent unraveling. The next time your string runs out or tangles, don’t reach for a new head—just rewind the spool and get back to trimming your yard in no time.