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08-09-2011, 01:16 PM #15
Dan,
I think you are slightly mis-imagining the structure of a Kamisori. The Ura is extremely hollow. Even if you honed only on the Ura, it would take a very long time to flatten out and remove all of the hagane (though, of course you are right about the thinness of the Hagane). Even so, doing that would eventually lead to the edge contacting with the Jigane on the Omote, which is why Kamisori are honed primarily on the Omote--to get all the jigane away from the edge.
Also, and I'm not sure how relevant this is, Iwasaki razors are hardened to a very high level--about 64 Rockwell. This is a point of pride with them, and a real pain for some of us honers. Just another data point.