...the 750 had spigots from 69-76, then collars and "shims" after that...what year is u'r bike? Its sounds like you have the collars. Don't impact the collars on, just a good snug tightening will do it. If you indeed have a 77 or 78, then the bolts are actually studs with thread on both ends. The can be removed and the older style spigots can be used.