I have a 25 year old Craftsman 12" Radial Arm Saw. The motor has a 5/8" arbor. New 12" saw blades all come with a 1" hole. I need a bushing to reduce the 1" hole to fit the 5/8" arbor. I have called Sears parts, service, stopped by the store, etc. nobody has been able to help me. Any suggestions?