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But the Koma is irreverent to a good edge, the Tomo is used at the final stage, after the Koma.
I've got the full set of Mikawa naguras, Botan, Mejiro, Tenjio and Koma, I use them just for fun.
You...

I'm still a little skeptic to how flat it gets with a plate and loose powder, that's how they used to make lenses in the old days.

I got a few Ohiras myself, all to soft for razors.

Lapping is a very good idea, both to make sure it's flat and to get a fresh surface.
Oil, dust and other things in the air gets stuck on the...