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The head of Shapton USA, Harrelson Stanley, used to say that you could tell the stone was flat when the color was consistent from end to end .......... IIRC.

Somewhere along the way someone...

Fortunately for me, I guess, I don't hone that much, so I haven't used the 20k a lot. I'm sure you've seen this post of bobski's contact with Stuart of Tools Of Japan. Of course cleaning with a...