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There is no way to put a "grit rating" on a natural stone.

I think it is a neat idea to grab one and try it.

The main problem I see with grabbing a random stone is if you find it is good you...

I have this vision of finding a good stretch of concrete road and tying it behind a truck and pulling it for a mile or two.

My uncle did similar with a walnut burl cutting board that is my...