So 2 years ago I was riding and threw my drive chain, but it went forwards and shattered the drive sprocket and punched a hole in the transmission. Well, over the last 2 years I have touched on it off and on, and I am finally back at the reassembly stage. When I go to bolt the drive clutch back on, I find the crankshaft is turning inside of it as I am trying to get the thing bolted down tight enough. Any tips?