or this one: Amakusa Red 800 Grit Natural Coarse Stone, Coarse Grit Stones
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Thanks for those links Shooter, I think I'll order one of those to try out. If worse comes to worse they will make good doorstops.
Thanks for the links. Now I know that I already have the Amakusa Red and tonite I ordered the Amakusa White. These should work with my Aoto & other natural Japanese stones. Now I have a full progression.