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True,

I can understand the use of convex stones.

Can concur that when honing my Katanas with flat stones, some convexity to them would make it easier to hone the edge and keep the rest of the...

Nothing about convex hones is better than regular straight hones to me.
Faster, sure, a shortcut sure; better, not to me.

They're also a PITA to create and to maintain; for that alone I find them...

yeah, true.

Thanks for the pics.

Exactly, this is what he is talking about, hollow grinding the edge.



When talking about razor sharpening, he makes a reference to figures 2, 3, 5 & 6.

Anyone know where these are to be...