I have a XTM Mammoth that has not ran in awhile because of clutch bell issues. The top bearing keeps breaking. So earlier I went to my LHS they race only electric but I figure they would know about nitros. The guy not best people person gave me a bearing that fit for $2.50! So I just bought it anyway cause I wanted to smell burning nitro. I went home sarted to screw it in and it broke! The outside of the bearing fit snug with the inside of my clutch bell. If that makes any sense. But what am I doing wrong? Any tips? I went through Rolex's post about clutch's.