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I bought two Norton stones, one 4/8K, and one 8K, both brand new. Neither of them were flat. One had a football shaped divet in the middle. Nenad is right if you're going to use the X-pattern,...

1. Most definitely flatten the hone first. I use 3/8 inch think plate glass, about 15x15 inches square, and start with 400 grit sandpaper on the glass. The hone and the sandpaper should be wet, of...