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I picked up some 3M wet/dry grit sandpaper and a 80 grit emery sheet. Lapped the nortons on 80,220,+320, did a great job of flattening. The chinese 12k will need a little more work. After a couple of...

Have norton stone kit and a chinese 12k. Even though the pencil lines are removed during lapping, done several times on each stone, the stones are not perfectly flat. Using the lapping stone which...