Leather tool honing block
thingiverse
This is a tool designed to hone the inner and outer profiles of leatherworking tools, such as hole punches, edge bevelers, etc. which have very narrow profiles. Simply place sandpaper between the block and the tool you're sharpening. This is (currently) untested, but if there's enough interest I'll refine it and try it out on my own tools. Chiefly, this is designed to work for the smaller tools that are very difficult to sharpen. The profiles are 1, 2 and 3 mm on the squared blocks, and 2, 3 and 4mm widths for the rounded profiles.
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