Spyderco triangle adapter
thingiverse
A simple accessory for Spyderco Triangle sharpening stones for freehand sharpening of special knives. It can be attached to a worktop or board with clamps or screws. The sharpening rod lies in a triangular groove and can be changed quickly. Update: Since the first part (single) works well for my application, I added a double version for larger blades.
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