If you look at it logically the Nagura steps are a progression so they are obviously coarser than the base stone . Just don't crush the stone with your diamond plate. Less is more here too.
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If the 1200 came in a finger sized version i'd buy some.
Although i suppose youd be making a slurry and lapping at the same time with the big one .
Maybe I'm confusing nagura and tomonagura here, wouldn't tomonagura slurry be finer than diamond raised slurry? At least Maksim and the Japanese metal masters he spoke to don't use diamonds: Diamond Plates VS Naguras.
It's a YMMV thing. Some love diamond plates, others hate them.
For Jnat experts, Maksim doesn't like them, but Alex is using only diamond plates in his videos. Still, I don't think one of them is right and the other wrong. Listen to their advices, and then, choose for yourself after you tried them.
Post #33. "If you have an equally fine Tomo then it's all good but Botan to Koma is coarser than your Asagi, hence the progression."
Personally I feel I get 100% out of my finishers whether I use tomo nagura or diamond plate but I get 101% when I finish with 4 or 5 light strokes on my finisher when it is dry. I never shave off a tomo slurry. I always go to water then dry so for me what happens at any slurry stage is not the end game.