14° is about the most acute I can go, and I do so on most of my commonly used blades, Paramilitary 2, Dragonfly, a Sebenza 25, Endura, Delica and a few Benchmades. I tried going to 13° on the PM 2's because I like Spyderco's version of S30V and I know it can handle that angle, but when I mount the blade the moveable-side stone always ends up rubbing on something, the mount itself or the screw tip.
But 14° on the PM 2 or Endura, etc, makes the knife a slicing machine, so I'm happy with being able to get that. I agree that a wider blade (from spine to edge) or one mounted higher in the clamps gives you the ability to sharpen to a more acute angle. The new arms are worth the upgrade if only because the angle can be so precisely set.
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