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The Nubatama is the Medium stone, though it is hard, with very little slurry off the 300 diamond plate, but does cut fast.

Yes the 20k is an interesting stone, which is why I am looking at the...

What are your Suehiro Gokuymo 20K Secrets?

I got a Suehiro Gokuymo 20k recently and have been experimenting with it.

Pretty much, it has taken the place of .3um film as a high grit synthetic...