In some ways this seems kind of obvious, but as a newbie, i can't fall into that trap. From what I have gathered from the very helpful folks on this forum, the ratio of width of the blade should be at least 3.5 times if not closer to 4 times the thickness of the spine so as to get a proper edge bevel angle when using he spine as the "honing guide." I would think that this would mean measured from the lowest part of the "spine" or flat part of the blade that makes contact with the stone, correct? I ask because I see pics of some very nice, fancy razors that have wedged along the spine, so the point of contact with the stone for purposes of measurement would be the "rib" running below the spine.