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I believe that after multiple stroppings to keep a razor keen, the edge becomes concave and requires a reset to 1k eventually. However, Like Utopian said, sometimes you can get away with a 12k...

If you must and really cannot get the Norton stone, King makes a 1k/6k stone that will work. I think they are less than 50. The auction site has them at $40 or less. Some people are using it with...