I heard that buffing wheels only hold up to a certain amount of RPMs before they either disintegrate or don't work for some reason. I am trying to buff a piece of silver. A Dremel drill fit with buffing wheel doesn't have enough RPMs to do the job. A grider with about 3,500 would do but I don't have one. Any suggestions?

I'm in a bind. Trying to replace the thermocouple on my water heater has been a nightmare because of one screw. In order to get the manifold assembly door off, I had to drill a hole into the final screw's head to disconnect it from the screw body (It was the only solution- I tried every other). The screw was just turning, and turning, and turning, without actually being extracted. Tried screw extractor bits after my adventures with vice grips and pliers just warped the terrible metal of the hex nut/washer beyond all recognition. Here's my situation: Turns out what it was screwing into is loose and "floating". But I can't think of any way to get it out or replace it. Gripping the inside part with a vice grip/pliers while trying to unscrew the screw with another pair of grips/pliers hasn't worked. Please help me. I've been without hot water since monday because of this.