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True, DMT used to recommend nothing finer than the DMT C for waterstones.

Depends.
Cosmetically I think a DMT 325 gives a smoother looking finish than the Atoma 1200 but I have never measured the depth of the scratches & am not likely to. As I said in my pm, it makes no...

Ahhh ! I see now. You were taliking about flattening & I was thinking maintenance lappping &/or slurry production.

Think about it. How out of whack should a 8k + stone get with the normal few...

What did he recommend as the ideal lapping tool for the 20 k then or did you save money by not having a flat stone. ;)

I've been lapping my expensive jnats & 8k & above stones with the 1200...

And you can replace the abrasive sheet if you ever wear one out. :)

I've only seen 1 out of 6 Atoma that had a small high spot. The design is very different to the DMT .

Unless you see obvious high spots evidenced by scratches in your stone there is no need to break in an Atoma for stone lapping.