There is a brass bushing that slips over the shaft and the clutch bell slips over it . The bushing winds up hanging up on the shaft and the bell causing it to drag and catch making a terrible noise. I ran into this problem a long time ago and just lightly lubed the bushing . It only temporarily fixed the problem . I have since heard that you are supposed to soak the bushing in a particular type of lubricant over night, or less if heated. I can't remember what the lube was, But I'm almost sure the info was on this forum. It had me stumped cause disassembled everything looked ok, then I noticed some galling on the bushing.