Take the little plug off the tranny, spin the gears until you see a slot in the white gear inside. Then hold the spur and spin the little shaft that sticks out one end of the trans until you see a setscrew, now, on mine there is two screws, one that goes directly toward the shaft you are spinning, the other goes beside it, that is the one you want. tighten it up a little at a time to see what happens. does that make any sense?