11. Check the end play of the mainshaft next. You must first install the 5th driven gear into the righthand transmission bearing. Push the gear in as far as it will go by hand. Then move it the rest of the way by tapping it with a soft faced mallet. Install one of the mainshaft needle bearings into the center of the gear. There is a 10 mm wide spacer that goes in next, then the other needle bearing. Put the mainshaft, with all its shims, into the gear, and with the center gasket in place, install the left case and secure it with five screws.