I don't know, this is an old dark reddish brown rectangular stone. Its even beat up a bit with what appears to be breadknifing lines in it.
Jimmy, your probably correct as usual.
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I wonder how hanging strop people can benefit from this insight, I suppose just strop extra lightly?
Well, just for clarification I use a hanging strop. But if your saying people that hang their strop up at an angle I'm not sure.
It did occur to me though a few years ago that people that hang their strops up at an angle are using less pressure downward into the strop already.
AFD,
I think I have the concept of "air guitar", ala Risky Business, down, but I'm not sure I can envision the negative pressure "air strop". :hmmm:
:nj