Shut off the KM110R engine by pulling the throttle lever back to the "Off" position.
Disconnect the wire from the tip of the spark plug on the back of the engine.
Raise the black lever on the shaft of the power tool where it connects with the trimmer attachment.
Press and hold the spring-loaded locking buttons on the side of the shaft with one hand while hold the trimmer attachment with the other.
Pull the trimmer attachment off the drive shaft of the KM110R.
Unscrew the base cap on the trimmer head to expose the line reel for restringing. Wrap new line counterclockwise on the spool.