I just bought a 14" cutoff saw (Dewalt HD ) I cut 2 cuts of 4x3 5/16 wall tubing and then it fell flat on its face. It throws hardly any sparks and goes nowhere. I assume that the wheel is loaded up or glazed. I ran a small die grinder against it while it was winding down and it helped a little, about 5 sec. Is there a good way to deglaze? Should I chuck the wheel an purchase quality one? ( blade says it is a stud wheel (for sheet metal?)) What kind should I get. I can't buy new wheel every time I cut a large piece. What do you think?