Sachs 200 - 22-13. Grasp the output end of the mainshaft and the magneto half of the crankcase and start the end of the mainshaft into the loose gear. Keeping the magneto side of the crankcase level, slide it down onto the crankshaft using the studs as a guide until the bottom of the mainshaft touches the guide plug. Remove the guide plug and lower the crankcase a little more keeping it level. The rollers on the layshaft may not be perfectly aligned with the crankcase but turning the gears back and forth slightly will allow the crankcase to drop into position.; 22-14. Remove the guide studs and replace them with metric screws. Metric Allen socket-head cap screws can be used and more torque can be applied to the screws without damaging the heads. Do not over-torque the screws because they are threaded into aluminium and it is possible to pull the threads out of the aluminium. If this happens, the holes will have to be redrilled and steel heli-coils inserted. The screws should be as long as possible to engage the maximum number of threads.; 22-15. Tighten the screws until the transmission halves are firmly joined. Turn the gears while tightening the screws and check for any binding or friction. If the gears do not turn freely in first and fourth gear, the shaft end spacer will have to be replaced. It is also possible that the sliding gears are rubbing on the 1 st or 4 th gears.; 22-16. Check the shaft endplay to determine if the end spacers are the correct thickness.