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You are correct.

There is a minor risk when rolling the
blade over at the end of the hone to touch
the back on the hone. A practiced cautious
hand would have no problem as you note.

To...

I think I found a reason to tape the spine.

First the razor that enlightened me. Looking at the
pix I guess I should have wiped the bit of the soap off a bit better.
34464

Now here is the...