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If your stone removes a lot of metal then it is most likely a prepolisher, but hard to really tell, it might be best to have it tested by someone that has experience with Jnats to be sure what do you...

Did you watch the videos I posted? They should answer your question how to use nagura and tomonagura.
Chances re you may not find a Koma, they are super rare now and very expensive. Tmonagura is a...

He is new to Jnats, that is his first, and also he has no other stone to compare to.
The water method only shows relative hardness to other stones not absolute hardness.
Hardness is not the only...

What naguras do you have? Also got a tomonagura?

Fist of all there is no right way to use a Jnat, in general use nagura then tomonagura
here a vid I made a while a go how to use that method:
Nagura Honing 1 - YouTube
Nagura Honing 2 - YouTube...

George my advice to you is to put it away and start with a nice synthetic to learn honing.
Going backwards in stone progression with a Jnat at that is a huge undertaking.