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Well, I have one of those sets. The cylinder is a very thin, flexes a bit and a slot is cut lengthwise for the full length of the cylinder. It slides over the spine of the microtome and provides a...

Try this

http://straightrazorpalace.com/advanced-honing-topics/21953-how-bevel-affected-taping.html

That is a big assumption. I took a Herder razor blank to Mike Blue's workshop and we measured the Rockwell hardness on his tester.
The edge came in at 59.8 and the spine was 54.? on the HRC scale.
...

Oops!:o Got off track there.

Ya, I think they used a slack strop or loom and probably a dished sharpening stone or they raised the spine off the hone. They did whatever was required to get an...

I speculate that the hardness of the spine is less than the hardness of the edge. Therefore the wear on the spine from honing would be greater than the wear on the edge This would make the angle if...