what is the brass chamfered ring do to the shaft coming out of transmission and sits in front of the throwout bearing . i am getting ready to install a d-850 engine in a b6200d tractor. the shop book shows it but no name or what it is for one side has a bigger bevel than the other side. outside diameter is 1.024 inside diameter is .788thousands and it .256 thick . it fits the shaft with the splines heading into the clutch housing. how does it sit with the chamfered one way or does it matter?