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Interesting you mentioned that. I also have a Naniwa 12k and I bought a Nagura slurry stone with it to make the 12k more versatile(lower grit) to more aggressively "cut" when honing. While it isn't...

FYI--I've found this to be pretty useful. I'll move aside and let the others with wedge experience answer.

Theres a section on wedge honing in there:
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