While you wait for answers, we may have found some information which could help you.
Click here for Spare Drive Beltcraftsman circular saw blade spins when load put on?
Need to replace power cord on circular saw?
need capacitor ?
Need brushes for a craftsman circular saw?
Need switch...part #3-706796-01 (old Sear's part #)?
How do I remove a blade from an old saw?