I have a 1964 craftsman 100 tablesaw which I bought new. I've recently replaced bearings and added other refinements. Since then the saw ran really well. Recently and suddenly the saw started shaking severely, as if something really out of balance. I replaced the motor (Baldor- arm and a leg) but no joy. I've checked the trunnion bolts- they are tight. Th c-clip is still in place on the arbor pivot. I'm stumped. Anybody have suggestions. (I have a link belt on it.)