Reloading string trimmer line is an essential chore if you manage a lawn, but on many trimmers—like popular Ryobi models—one step tends to cause a lot of frustration: locking the trimmer head back into place.
If you find yourself wrestling with a head cover that feels impossible to twist and lock, you don’t need a new tool. A simple household maintenance trick will solve the issue in seconds.
The Problem: A Head Cover That Won’t Twist
To secure the trimmer head cover after reloading your string, you must line up the tabs with the holes, press down against the spring, and twist the cover until it clicks into place [00:21].
Over time, plastic friction, dirt, and spring tension make this twist extremely stiff and hard on your hands.
The 10-Second Solution: Lubricating Oil
A quick drop of lubricating oil—such as standard 3-In-One oil or multipurpose lubricant—makes locking and unlocking smooth and effortless.
What You Need:
- Any general lubricating oil (precision spout bottle or spray)
- A clean cloth or rag (to wipe any excess)
Step-by-Step Instructions
- Access the Mechanism: Remove the trimmer head cover and take out the spool assembly so the spring and contact points are exposed.
- Apply Lubricant: Add a small amount of oil around the spring seat and contact channels where the parts twist against each other.
- Reassemble: Place the spring and spool back into position, pulling the trimmer lines out through their eyelets.
- Twist and Lock: Align the tabs with the head cover and twist. The parts will turn smoothly with minimal hand force.
Why It Helps
If you have a medium to large yard, you probably reload trimmer line frequently. Keeping the trimmer head lubricated prevents wear on the plastic locking tabs and saves your hands from unnecessary strain every time you need a fresh spool. Plus, whatever household oil you use can easily be kept around the garage for squeaky door hinges or tracks.
Watch the Video Tutorial
Check out the step-by-step walkthrough in action:
Watch on YouTube