Just Got A Table saw, Delta shop master TS200LS, When I turned saw power on,it is very sluggish to get gowing and lots of grinding noise. I attempted to cut and the blade stoped. I changed from a 15 amp to a 20 amp braker thinking the saw was not getting enough power. Saw runs not as sluggish but still very bad grinding type noise. I checked the blade and it is loose and not rotating evenly with the power shaft.I attempted to tighten the nut on the shaft but is just moving with the bushing type fitting on the other side of the blade.Is their a special tool to use to tighten the blade? Could a loose blade be the entire problem or is the motor in trouble as well?