I have a MK III Commando. The gradient has a 1/2" shaft that sticks out the front of the transmission case, held in place by a spring clip. Does anyone know how much end play is allowable or necessary for that shaft. In an effort to keep the o-ring in place to reduce the amount of oil I loose from the shaft, I put a shim between the washer and the spring clip. The o-ring is now properly in place, but there is no end play in the shaft.