Thinking of changing my 05' f7 sp to the o6' secondary. First off, what measurement is the 10.0 and how does it change to a 10.4 by milling the sheeves?which brings me to my next question? is it the same to mill the 10.0 than to buy the 10.4 conversion? what about primary clutch differences and gearing diff. between the 05' and 06' I guess what i'm trying to do is eliminate some belt slip but don't know what the best way to go is. are allyou guys changing gears too when converting to the 10.4 , primarys too, or just the clutching? HHHEEELLLPPPPP.