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 (the holder closest to the handle) with my convex attachment, and you will be able to sharpen your knife to a convex angle.

If you find my designs useful, please go ahead and click on "Tip Designer" to the right of the photos at the top of this page. Proceeds will be used to purchase printing filament so I can keep designing and testing cool new things that you might find useful.

Thank you!

NOTE:

Some of my other useful designs:

https://www.thingiverse.com/leadingedge/designs