I'm rebuilding my NV4500 and when installing the countershaft, the rear bearing sits proud of the case. Shaft spins freely until trying to tighten the bearing retainer plate and then it binds up. Bearings are Koyo brand. Front bearing cup in the case and both shaft bearings appear to pressed on as far as they can go. The rearward bear cup in the photo is a slip fit. I'm stumped at this point and any help is greatly appreciated.