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Just one. They pretty much are interchangeable.

If you have a chance to meet with Bob Keyes, by all means do so. I never have met him but I've seen enough of his work to know that he is an expert.

Also, check the red stickies in the top of the honing section of the forum. Feel free to ask questions there about honing and questions about hones in the hone section. If you update your profile...