Here is the picture from the original thread-

Hmmm, that's a big one! See-Saw pawl from the look of it. Selector knob must be removed, then the pawl, pawl spring, and ball should come out of the top there. I doubt that 1" drive gear teeth are worn badly, just clean and lube and reassemble.
Update: Guess I was wrong. Looks like it's got 4 separate tic-toc pawls that engage and disengage in sequence to get it to ratchet. Yikes!