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Actually, Norton makes the prep stone for that purpose. When I had my Norton combos, I lapped on a DuoSharp, but used the prep stone to keep the surface clean.

If you have a good surface to lap...

I agree. Ceramic tile can have lots of variance, including a domed center.

Years ago, I found a piece of glass next to a trash bin. It looked to be a wall shelf or part of a table top. It's flat...