I watched a youtube video of how to remove the primary clutch the proper way. The guy says he uses a locking bolt to lhold the crankshaft in position. I cannot find where he puts this bolt in the motor to hold it into position. I have the online manual and it dose not show that technique being used. I started to clean my clutches but stopped short of removing the sheaves because of lack of confidencein what im doing. Is it really necessary to lock the crankshaft or is the right way to do it. I also dont see that bolt in the repair book, maybe for earlier models or larger than the 650. The other part that confuses me is when removing the secondary clutch ,,then re insatlling it the put a screwdriver in the back of the helix and spring, what are they trying to do here, anybody know, let me know thanks.