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If the stone is not flat or smooth, as you hone you will reveal fresh stone face, that has not been lapped and is nowhere near as smooth as the parts that have been lapped flat and burnished smooth....

An Ark edge is a different edge, crisp and keen. I would go to an Ark after a 12K, never have done so after a 16K, though I doubt it would hurt. More important than grit size progression, is how the...