How Do You Restring a Weed Eater? Step-by-Step Guide

Safety First: Preparing Your Weed Eater

Before you touch the spool head, safety must come first. Weed eaters can accidentally start, causing the spinning string to injure your hands or face. Always disconnect the power source completely before beginning any maintenance:

• Cordless models: Remove the battery entirely.
• Electric corded models: Unplug the power cord from the outlet.
• Gas models: Turn off the engine, allow it to cool for at least 5 minutes, and remove the spark plug wire to prevent accidental ignition.

Wear work gloves to protect your hands from sharp line edges and small metal components. If your weed eater has recently run, allow the head to cool—metal spools can become hot during operation. Clear your work area of obstacles and place the weed eater on a flat, stable surface or hold it securely in a vise.

Understanding Your Spool Type

Weed eaters use three primary spool mechanisms. Identifying which one your model has is essential because the restringing procedure differs significantly for each:

Bump-Feed Spools

Bump-feed spools are the most common type found on residential and commercial trimmers. They feature a slot or opening on the spool where you insert trimmer line. When the spool rotates and the line touches the ground, it automatically “bumps” or feeds more line from the spool. This mechanism requires minimal user intervention and is the easiest to restring.

Manual-Wind Spools

Manual-wind (or fixed-spool) designs are found on older and professional-grade trimmers. These spools have a center post around which you manually wrap the trimmer line in a tight spiral. Both line ends are held in place by small notches or slots. This method requires more care and precision but offers excellent line control.

Automatic-Feed Spools

Some premium models feature automatic-feed mechanisms that gradually advance line as you use the trimmer, requiring no bumping or manual intervention. These often use cartridge-style line packs. Consult your owner’s manual for specific restringing instructions if you have an automatic-feed model, as procedures vary by manufacturer.

Accessing the Spool Head

The spool head assembly sits at the bottom of the trimmer shaft. Most heads are held on by one of two methods:

Twist-Off Heads

The most common design uses a threaded collar. Grip the shaft firmly with one hand to prevent it from spinning. With your other hand, grasp the outer collar of the spool head. Turn counterclockwise (lefty-loosey) until it spins freely and can be lifted away. Note the orientation of the head so you can reinstall it correctly—most have an arrow indicating the winding direction.

Clip-On Heads

Some models use a clip or snap-on design. Look for a small clip or tab on the side or underside of the head. Press or slide this clip inward while gently pulling the head away from the shaft. If you’re unsure where the clip is located, consult your manual or examine the head closely before applying force.

Tools You’ll Need

• Work gloves
• Replacement trimmer line (verify the correct diameter for your model)
• Scissors or a utility knife to cut the line cleanly
• A small brush or compressed air to remove debris from the spool area (optional but helpful)
• Your owner’s manual (helpful for identifying your spool type and line specifications)

Removing Old Trimmer Line

Once you have the spool head off, inspect it for remaining line. If old line is still wound on the spool, remove it completely by hand or with scissors. Do not reuse old line—it may be cracked, brittle, or improperly wound, which will cause feeding problems.

Use a small brush or a cloth to wipe away grass clippings, dirt, and debris from inside the spool cavity. If the spool is caked with dried grass, rinse it with clean water and allow it to dry completely before winding new line. Debris trapped under new line can prevent proper feeding and cause the spool to jam.

Loading New Line: Bump-Feed Method

Bump-feed restringing is straightforward and the most forgiving method. Follow these steps carefully:

Step 1: Determine the Correct Line Diameter

Check your owner’s manual or look for markings on the spool head itself. Standard residential trimmers use one of three diameters:

• 0.065 inches (1.65 mm): Lightweight, for light brush and grass
• 0.080 inches (2.0 mm): General-purpose, most common for residential use
• 0.095 inches (2.4 mm): Heavy-duty, for thicker weeds and tougher jobs

Using the wrong diameter will result in feeding problems or poor cutting performance.

Step 2: Cut a Length of Line

Most bump-feed spools hold between 20 and 30 feet of line. A safe approach is to cut a piece approximately 4–5 feet longer than you think you’ll need. You can always trim excess line after winding. Use scissors or a utility knife to make a clean, straight cut.

Step 3: Thread the Line Into the Slot

Locate the slot or opening on the spool head where line feeds out. This is typically on one side of the spool. Insert one end of the line into the slot, pushing it in about 2–3 inches. This end will be held by the slot as you wind.

Step 4: Wind the Line

Check the arrow on the spool head—it shows the direction you must wind. Wind the line in the direction indicated by the arrow, wrapping it tightly and evenly around the spool. Each wrap should sit neatly next to the previous one without overlapping. Maintain light tension as you wind to prevent loose, tangled line.

Continue winding until you have loaded most of the line, leaving 4–6 inches unwound. This remaining length will serve as the second line end that feeds out when you reinstall the head.

Step 5: Secure Both Ends

Most bump-feed spools have a small notch or ridge on the rim where you can tuck the end of the line to hold it in place. Guide the wound line end into this notch so it won’t unravel during reinstallation. The 4–6 inches of unwound line should remain loose so it can feed through the slot when the spool head is reinstalled.

Loading New Line: Manual-Wind Method

Manual-wind spools require more precision but are still manageable with careful attention:

Step 1: Identify the Center Post

Manual-wind spools have a raised center post in the middle of the spool cavity. This post is what you’ll wrap the line around. You’ll typically wind line around this post in two separate sections, one on each side, to load both line ends.

Step 2: Cut Two Sections of Line

Cut two pieces of line, each about 15–20 feet long. These two sections will create the dual-line setup typical of manual-wind spools.

Step 3: Wrap the First Section

Hold one end of the first line section against the center post. Begin wrapping the line tightly around the post in a spiral, working downward or upward across one side of the spool. Keep tension consistent and ensure each wrap sits neatly next to the previous one. Wrap until you’ve used most of the first section, then secure the end in the small notch or slot provided on the spool rim.

Step 4: Wrap the Second Section

Repeat the process with the second line section on the opposite side of the center post, winding in the same spiral pattern and securing the end in another notch or slot.

Step 5: Verify Line Positioning

Both line ends should be held securely in their respective notches, and the wrapped line should look even and tight with no loose coils. The spool should feel balanced. If line is bunched up or loose in places, unwind and start over—poor winding will cause feeding problems.

Reinstalling and Testing the Spool

Now that your spool is loaded, reinstall it on the trimmer shaft:

For Twist-Off Heads:

Align the spool head with the shaft thread. Note any alignment marks or arrows on the head—these typically indicate the winding direction and must face the correct way. Thread the head back onto the shaft by turning clockwise (righty-tighty) until it is snug. Do not over-tighten, as this can strip the threads or make the head difficult to remove next time. Hand-tight is sufficient.

For Clip-On Heads:

Align the head with the shaft, then slide or press the clip into place until you hear or feel it lock securely. Gently tug the head to confirm it is seated properly.

Thread the Line Through the Eyelets

Most spool heads have two small eyelets or guides on the exterior where trimmer line exits. Guide each line end through these eyelets so both ends hang freely below the head. The lines should exit parallel to each other and not be twisted.

Reconnect Power and Test

Reattach the battery (cordless models) or plug in the power cord (electric models). Do not use the trimmer yet. Instead, squeeze the trigger briefly in short bursts while holding the trimmer at a safe angle away from your body and others. The line should advance slightly with each bump or pulse. If the line does not feed, the head may not be fully seated—remove it and try reinstalling. If the line feeds but immediately breaks or unravels, you may have wound it incorrectly or under too much tension; unwind and retry.

Troubleshooting Common Restringing Mistakes

Line Won’t Feed or Advance

Cause: The spool head may not be fully seated, or the line ends are not positioned correctly in the eyelets.

Fix: Remove the spool head, confirm both line ends are threaded through the eyelets, and reinstall the head firmly. If the problem persists, unwind the line and check for tangles or bunching inside the spool cavity.

Line Keeps Breaking Immediately After Restringing

Cause: The line may be wound too tightly, kinked, or the wrong diameter for your model.

Fix: Verify the correct line diameter in your manual. Unwind the spool completely, inspect the line for kinks or damage, and rewind with slightly lighter tension. If the line is kinked, discard it and use fresh line.

Spool Head Spins Loose During Use

Cause: The head was not tightened sufficiently during reinstallation.

Fix: Stop the trimmer, disconnect power, and tighten the spool head by turning clockwise. Hand-tight is usually sufficient, but ensure it does not spin when you grip the shaft.

Line Tangles or Bunches Inside the Head

Cause: Line was wound unevenly or overlapped itself during winding.

Fix: Completely unwind the line and rewind slowly and methodically, ensuring each wrap sits neatly beside the previous one with no overlaps. Maintain consistent, moderate tension throughout.

Frequently Asked Questions

Q: How often should I restring my weed eater?

A: This depends on how frequently you use the trimmer. Light residential users may restring every 1–2 years, while frequent users might need to restring every few months. Restring whenever you notice the line is too short to cut effectively or has become brittle or cracked.

Q: Can I use any brand of trimmer line, or does it have to match my trimmer brand?

A: Generic trimmer line of the correct diameter works fine in most trimmers, regardless of the trimmer’s brand. What matters is matching the diameter (0.065″, 0.080″, or 0.095″) and material type specified in your manual. Using the wrong diameter may cause feeding problems.

Q: What is the best technique to avoid winding the line too tightly?

A: Wind slowly and deliberately, maintaining just enough tension to keep the line from sagging or looping. Think of it as winding thread onto a spool—snug enough to stay in place, but not so tight that it deforms or strains. If you’re unsure, rewind with slightly less tension; loose line is easier to fix than over-wound line.

Q: Do I need to replace the entire spool head, or just the line?

A: Just the line. Spool heads are designed to last many years. Only replace the head if the plastic cracks, the threads strip, or the clips break.