how to replace your line by winding it on remove the battery pack before replacing the line for safety when the battery is out press the release tabs on the spool retainer and remove the spool retainer by pulling it straight out now you can remove the spool and clean the inner surface of the spool base with a clean cloth check the spool retainer spool and spool base for where and if necessary replace the parts now take about 16 feet of new cutting line and fold it in half adjust the line so that one end is four inches longer than the other hook the folded end of the cutting line onto either of the slots in the spool and wind the line in the direction indicated on the spool winding the line in the wrong direction will cause the bump head to operate incorrectly place the ends of the line in the two opposite notches in the spool with about four inches sticking out of each side align the notches of the spool where the line is sticking out with the eyelets in the spool retainer and put the spool in the retainer with the spool and spool retainer in your hand grab the line and pull it to release it from the notch in the eyelet with the spool base facing down align the tabs on the spool retainer or the slots on the spool base and press the retainer down evenly until it snaps into place you