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Yup, they weigh between 200-300 lbs each!:D

Exactly what I was thinking. My intention is to use them for the very hard natural stones like Arkansas, Charnley Forest, CH12k, TOS, etc. and using it to do the bulk of the coarse work.

I was...

Thanks for that link. It confirms an idea I had. I just picked up 3 of those but mine are
2' x 2' precision ground cast iron surface plates. The precision grinding does leave a surface texture that...

Your experiment reminds me of some that were done with the Spyderco hones using various slurries. I used a natural nagura and some garnet. In both cases the hone functioned as a substrate to hold the...