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JOB15 is right. I touched up the same Friodur razor again, this time ending
with the escher only, and the shave was a bit better...not quite as smooth,
but plenty keen enough.

Thank you, sir!

I'm not sure that it matters much how you get to 12K, as long as the bevel is good.
It seems to me that it's mostly a matter of preference and efficiency...whatever
works for you. I use Chosera 1K,...