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Oh, mornin' dumbness. It's a very obvious trigonometry problem.
I already solved the question.
Just need my caliper now.

Let's try!
My thoughts were on the other side of the problem. I was guessing the edge is too obtuse, needing LESS tape, but you had enlighted me that the problem can be just the opposite.
Thank you...

Last week I finally received the shipment of this Heljestrand MK42 Viking in stainless steel. Accustomed with full hollows carbon MKs (1,31,32), this razor proved to be a completely new beast to me....