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I also hear recently that you could use a diamond hone to work up a slurry. I think that could very well be the best idea.

I try to air on the side of caution when it comes to such matters, because A: I don't have much experience and B: when a guy who has been dealing with hones some 40-50 years who am I to challenge?
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I was to understand that the Nagura needs to be from the same or harder stone to produce an efficient slurry. I was surprised when I was given a different stone as a Nagura which produces a slurry...