I have a Craftsman 137.248760 table saw that has recently started giving me problems. When I run the saw, the blade appears to loosen and continues to spin freely on the arbor after I turn the saw off. I've tried tightening the nut back down and replacing the blade but it immediately loosens. It hasn't completely come off the arbor yet but I'm afraid it will.
Any ideas how I can make this stop happening?