Bill D., if you think dividing by zero ain't so bad, go look at Don Nichols' motto. And come up with a reasonably traditional tune for that beast of a song!
My work bench didn't stay clean long. I forgot to ask you if you ground and sawed and polished rocks. My Graves Cabmate diamond saws and polishing compounds and such are in a closet. If you need to route or drill some small holes in anything hard, I've still got a few 3/4 mm dia. diamond drills that work very nicely for that sort of thing. They fit fine in a Moto-tool. Clamp the Mototool to a rod with a point on the end and you can swing it in an arc. That's how I made curved slits in graphite rods used as blackbody sources. (Matched to curved slits of Ebert spectrometer)