or just use the right size bolt for the sleeve. If it needs a 9/16" bolt, get it, don't try to use a 1/2" or it will end up looking like the hippies.

You can't have any play between the bolt and the bolt sleeve, the shank of the bolt should go almost all the way through the sleeve. Many times, I buy an extra long bolt for the longer shank - and just cut off the extra threads.