will need to be removed from the trimmer for step 3a (short shaft) or 3b (long shaft).
step 3a: place nut or bolt into the well of the weed thrasher.
step 4a: using your thumb, hold nut or bolt firmly in place on the weed thrasher head. slide the head onto the shaft and turn the weed thrasher head with nut or bolt together to fasten. firmly hand-tighten.
step 5a: press glider cap firmly into weed thrasher head.
step 3b: firmly press the sleeve into the well of the weed thrasher head.
step 4b: place nut or bolt into the sleeve. slide the weed thrasher head, sleeve, and nut or bolt onto the trimmer's shaft. 