Look at the bottom of the trimmer head and line up the arrow on the inner spool with the arrow on the inner reel.
Insert 10 feet of line into one of the holes on the side of the trimmer head, and feed it up into the line-loading hole located on the inner reel.
Slide ½ inch of the trimmer line into the line-locking hole on the inner reel.
Pull the line back out through the hole in the trimmer head until the line is stout against the inner reel.
Duplicate the process with a second 10-foot string and the other hole in the trimmer head.
Rotate the inner reel counterclockwise until approximately 4 inches of line sticks out of the cutter head.