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Oh no!, you got it all wrong, it does not prove the razor is hollow ground, and was never meant as such, a blind man can tell the difference between a hollow and a wedge without this “test”.

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Again, you are also right, however you forgot to mention that the distance between the “double wheel” setup is adjustable, and it’s adjustable because as both wheels wear, the diameters become...

You are correct, but it’s not simply a test for improperly treated steel.

The razor grinder uses it to know when to stop grinding in that area… he will know the razor is thin enough to be...

No sir, your nail will not brake.... and the steel will bend.
This attached photo may help.
While not a NOS razor, but you can see the bevel is small, maybe smaller than most full hollow ground...

The bending of the razors’ edge is no myth; I have read it in a few old books… and it makes scene.
The theory is, if the blade was properly hardened and tempered, the thin edge will flex under...