I bought a Porter Cable laminate trimmer 7301 at a yard sale, old one with square base, and it gets really hot, too hot to hold after a minute or two. I assumed it was bearings so I bought OEM replacements, cleaned out any dust, new bearings. No improvement. I googled and found complaints of the collet getting hot but not the case. You guys think this can be saved? What else could cause so much heat?