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IIRC Mastro Livi did once make one for one of our members to protect the spine of one of his expensive razors.

I dare tot differ.
Perret in 1770 recommended honing with spine on the hone not off the hone. In those days hollow grinding had not yet been invented. If you look at the old wedges some of 'em have...

I have never seen taping being recommended in barbers' manuals so I guess it is a pretty modern invention of hobbyists who want to try many blades and sell them on looking near mint after having...