Interesting. Up or down the strop - pressure is pressure, it can be measured (its force, direction, application). Where one applies most pressure - I don't know, may be personal, or may be dependent on many many other things.

My take on this is that I have seen a broken fin (from overhoning) once or twice. That's it. This was a severe case, probably came to me through ebay.

The fin you are describing - what would be necessafy magnification power to see it?

Specifically speaking - i am used to thinking about a fin as one whole, and razors actually show little separate teetch, under the proper magnification... So I conceptualize stropping as simply aligning the teeth. Surely, with pressure some / many / all of them can break - but I have not seen this as I don't have the proper magnification.

Cheers
Ivo