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Yes, I've been happily raising slurries on many of my jnats for several years with an atoma 1200. In fact, I originally bought the atoma on the advice of So Yamashita for the sole purpose of raising...

So just buy yourself some nagura progression pieces and a base piece of marble/slate/something hard. Why fork out Jnat-cash on a base stone you don't use? I've never understood the "logic" behind...