So close now, so very close.

Pulled the coin unit apart and cleaned all the grease out of the moving parts and coil sleeves. Put everything back together and the cog still had drag on it. I tightened the spring, but no luck. I ended up loosening the nut on the wheel that was holding everything together. Another success.

So, the coin unit increments and releases freely. The game now goes up to three players, but not four. Adjusted the leaf switch on the coin unit. The game now allows four players.

Final issue: if you select a 2-4 player game, it keeps missing player 2 and jumping to player 3. Player 2 does not exist at the moment.

Cheers!
Adam.