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Actually, I have a 400 Atoma, and it work wonders on my synth waterstones, and my naturals too. I like to polish my Jnats more, because everyone says it is better that way.

I am happy to help...

Yes, the 140 will leave very deep scratches in your stone. Where did you buy that stone? It can happen that you don't need to lap it, or if yes, than not much. If the only stone you have is the...