I made the never-again mistake of using a few fiberglass electrical gang boxes on my recent remodel. It seemed like fiberglass would be better than the plastic boxes, but I learned my lesson there, I now have stripped screw holes on damn near every one. I will always use metal gang boxes from now on, for this reason. But what is the best hack to fix the screw holes on the fiberglass boxes? I don't want to swap them out.