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He is enjoying a one week holiday right now.
A dash of patience and he'll get back to you.
IME he is one of the very reliable ones out there, so not to worry:)

Tomo-naguras can be a bit finicky IME.

Contact someone like Maksim at japanesenaturalstones.com and tell him about your stone.
Chances are, he'll be able to find you one that works good with your...