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That is the first i heard this Lynn. I thought will all the water stones you were supposed to soak them before use. I dont leave it soaking all the time just put it in like 5 or 10 min before i use...

my crack looks exactly like my pencil line (.38 graphite) when i lapped it but it runs down the sides and i assume all the way through. i couldnt catch it sliding my finger nail across it and like i...

So here is the set-up, i took my cold naniwa 8000 and put it in a slightly less cool water to soak it. Heard like a pop 3 seconds later, took it out and the stone has a crack runing straight across...