Weed eaters, also known as string trimmers, are useful for cutting back grass in hard-to-reach places where lawn mowers won't fit. When it comes to adding line to your weed eater, it's a job you'll need to learn in order to use your machine effectively.
Determine what gauge of trimmer line your weed eater uses. Do this by looking in the owner's manual or looking up the machine's model online.
Remove the line spool from the weed eater head by twisting it off.
Measure and cut about 10 feet of line from your supply. Fold the line in half and loop it around the notch in the spool at the folded halfway point. The notch is located between the two tracks on the spool.
Guide one half of line onto one track, and the other half of line onto the other track. Begin turning the spool in the direction indicated by the arrows while feeding the two halves of line into the tracks.
Turn the spool, guiding the line until there is 6 inches of line remaining on both halves.
Locate the two eyelets on the other part of the weed eater head. Feed each end of line through each eyelet, then gently snap the spool back into place.