How to Restring a String Trimmer Changing weed eater string requires very few tools and doesn’t take long if you follow the steps below.

The trimmer string wraps around a spool that sits inside the rotating head. There are two methods to refill it—replace the whole spool, or rethread a new length of string.

Nothing is as frustrating, however, when your weed eater string breaks and needs replacing, leaving many wondering what to do and how to change it.