Adjusting the wire on your string trimmer is fast and easy with these steps. By removing the cap and current spool, then feeding the right amount of wire back through the trimmer, you will be back to working on your property in no time. Simply wrap the new line around the spool in the direction of the marked arrows, then reinstall the head. Be sure to take the proper safety precautions when disassembling and adjusting your string trimmer and other equipment. Find more tips and information on how to work your equipment with Minnesota Equipment.