String trimmers finish up the work that a mower starts, putting the final touches on your well-manicured lawn. If you use your trimmer often or at least as often you mow, you will undoubtedly need to change its string over time. This easy process requires winding one or two strings, depending on if your model contains a single or double string.
Turn the spool retainer counterclockwise while holding the string head to unscrew it.
Remove the old string from the spool.
Cut one or two pieces of string with a pair of sharp scissors, depending on if it's a double or single string model, each measuring about 2.7m or 9 feet long.
Insert one string in the spool's anchor hole and wind it counterclockwise around the spool. Place the end of the string in the slot on the spool flange and leave about 6 inches extending from the slot.
Repeat the steps using the second piece of string if using a double string model, but this time wind the string around the spool's bottom.
Place the spool and the spool retainer back on the trimmer.