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Dave, even a new chisel, on its flat back, may turn out to have a raised edge which will bite into a stone. again, "Trust me on this" :cry: <---me after 3 hours of hand flattening a dished...

Do yourself a favor, and run the chisel across some emery cloth or some other stone first. If you have any high spots or burrs on the chisel you will just grind a new scratch into the Charnley! ...