Turn your Weedeater over so the bottom of the cutting head is facing upward. Locate the spool cap at the center of the underside of the cutting head.
Grab the spool cap with your hand and turn it in a counterclockwise direction until it loosens enough to remove. Locate the cutting string spool, directly beneath the spool cap. Unwind all of the string until the spool is left empty.
Reset the string by winding it onto the spool slowly and carefully. Keep as much tension on the string as you can as you wind it, and do not overlap or cross prior string rows as you wind.
Clean out any dirt or debris which has gathered in the string release hole so a clear path exists. Slip the loose end of the string through the feeder hole in the side of the spool housing. There should be no obstructions, twists or kinks in the line. Release sufficient line through the hole to operate the Weedeater normally.
Replace the spool cap by turning it in a clockwise direction until firmly tightened. Plug in your Weedeater and test the cutter head.