Here is a beauty :w Note the micro chipping in the edge.
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Here is a beauty :w Note the micro chipping in the edge.
That may well be your definition, but I would say that the original "fin" spoken of in ancient tomes of barber lore is simply refering to the pliable V edge.
I do not think that there is a way to achieve a Y edge, without perhaps honing on a convex surface, which would impart a concave surface to the edge bevel.
I hone my razors under magnification and I have seen fins. When I do, I hold the razor vertically on a very fine stone like a Shapton 16k or 30k and with very little pressure draw it toward me. I then do three light pushes on the stone on each side moving away from me. This removes the fin in the same way a short, steep slope stropping will i.e. by fatiguing the fin and getting it off the edge. I'm in agreement that the V formed with no chips, fins, curls, fingers, etc. is the best shaving edge I get.