Replacing Line in the Line Trimmer Head (sounds complicated but once you have done once very easy). The spool can handle up to .095 line but the recommended size is .080. If you will use line thicker than .080 the black strip at the base of the guard should be removed and the line clipped with scissors to get the desired length.

1) There are 2 lid styles on this spool version. On one, if you turn the trimmer head case over to the side (base side) that attaches to the machine, you will see arrows that say "push to open" for the 2 clips that hold on the lid. On the 2nd version, there is one push clip to release and the lid can then be rotated clockwise to release.

2) If you have the first lid version above, you may be able to use your thumbs to press the sides of the case to make the cover release but the plastic is very heavy duty (which is a good thing) and you may not be strong enough. In this case, rest the case on the ground or table with the side that attaches to the machine facing up (side with writing). Slide a wide blade slot screwdriver in between the case and the cover where you would have been pushing with your thumbs. Gently rotate the screwdriver to push in the flange on the case and at the same time gently pry the screwdriver handle outwards away from the case. One side of the cover should pop off the ridge that is holding it to the case. Now do the same to the other side and the entire top should come off. You don't need a lot of force to do this - just a light touch.

3) Once the cover is off, don't lose the big spring or the metal washers that go at either end of the spring. The washers may stay in the right spots but they may pop off as well as they are just held there by friction.

4) Cut a new length of line and find approx half way point. Fold line here and hook the fold over the slot in the spool cartridge divider. Wrap both pieces of the line in the same direction in the appropriate groove going in the direction of the arrow on the holder. Clip each line end in one of the 2 small slots on the line holder cartridge to temporarily hold it.

5) Put the case on the table with the side attached to the machine (side with writing) facing down. Put a metal washer in the middle if it is already not there, and then put the spring in large side down.

6) Take the line holder cartridge and put your thumb and fingers over the line end holder slots to stop the line ends from coming loose. Make sure the metal washer is in the middle of the line holder cartridge and then put each ends of the line through one of the holes in the case. Push the line holder cartridge and case together while pulling the line ends through the holes until you can't leave your fingers there anymore. Make sure the spring ends are in the right place. Push the line holder cartridge and case together and hold while you gently pull each line end to pull the line off the temporary holding slots.

7) Put the cover over the line holder cartridge end and then snap the cover in place.

All done.