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For the cordless Grass Hog, the replacement spool is AF-100. You can purchase these spool heads online or maybe find them at your local hardware store, but they may be hard to find because the Grass Hog is not made any more.
Is this the cordless Grass Hog? Turn the trimmer upside down so you're looking at the bottom. There are two orange tabs on either side of the spool -- push these in and the head should pop up so you can pull it out.
On the new spool, feed the cord out several inches and stick it through the hole in the trimmer where the old cord stuck out. Then pop the spool into the cavity so that the orange cover faces out (toward you). Pull the cord taut and make sure it is not long enough to hit the plastic guard. If it is too long and it touches the guard, pull the spool off and wind the cord in a little bit. If the cord is too short, pull the spool off and thread out a little bit more length and try again.
Turn the trimmer right side up and turn it on to make sure it works. If you hear a loud rapid thumping sound that sounds sort of like a machine gun, the cord is too long and is hitting the plastic guard.
Which part of the Grass Hog did you take apart? If you mean the spool head, that is easy to reassemble. The actual spool (the round part with the line coming out) goes into the cavity on the bottom of the trimmer, with the line poking out of the hole in the side several inches (not enough to hit the plastic guard). Then the cover (orange with the spring on it) fits on top of the spool so that the spring pushes on the spool and the two tabs on the side snap into the holes in the trimmer.
Unless you took another part off, that should be all you need to do to reassemble the Grass Hog. Turn it right-side up and turn it on to make sure everything works.
- Turn the Grass Hog upside down - Push in on the two release buttons on either side of the spool (they're orange) - Pull the spool head off and spin it to release more string while you pull the string with your hand (make sure it is still fed out through the hole in the base) - Pop the spool head back into place
Test the Grass Hog to make sure the string is not too long. If it is you'll hear it cracking against the plastic guard on the base.
For Black and Deckers: Remove cup from bottom of unit by depressing 2 detent tabs and pulling away from unit. Replace empty spool with new full one or wind on aftermarket string. Wind in direction of arrow on spool. Make sure spool is seated on rachet firmly.
We have a Black and Decker CST 1000 and other than the convenience of no cord, it constantly has problems. Won't hold a charge, spool holder cap broke and we can't find the part, handle cracked and finally broke. We have a black and decker blower and it won't turn off either. Fortunately it's corded so we can just unplug it. No more Black and Decker for us.