Hapstone Convex sharpening attachment
thingiverse
This is a Convex edge sharpener attachment for the Hapstone M2 and Hapstone K1 sharpeners. It should also work well on the Hapstone R2, M3 and V8 versions. Simply replace your rear stone holder (closest to your hand) with the attachment, and you will be able to sharpen your knife to a perfect convex angle. I have 2 different versions available. One version is similar in shape and design to the current clamp on the Hapstone M2 and K1, and the other version is more rounded with the convex notches also in an arc. The best one for you would depends on your sharpening stone types. NOTE: Some of my other useful designs: https://www.thingiverse.com/leadingedge/designs
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