Below is my sharpening fixture for my Norton water stones. Surprisingly the keener angle is for roughing, the wider angle for finishing. The theory is the more acute rough angle will result in a very sharp, but also very fragile edge. So the finish side puts a slightly wider included angle on the finished edge for strength. The little loose block on top of the right stone helps me orient the knife vertically before stroking the stones.
...wasn't planning it, but since it's a gloomy boring day, and the stuff is out I'll go ahead and tune up a few edges.
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