I have been thinking about the even spine and edge wear thing, I don't think it woild hold true, as the amount of metal in contact with the hone would need to be the same on both ie if your bevel is 1/8" then the amount of spine in contact with the hone would need to be 1/8" or the narrower area would wear quicker, well maybe anyway, perhaps a metal working person could expand on or debunk this for me. Thanks ed.