I used a 1/4 inch chain saw file to shape and after heat treat sharpened it with a round diamond stick and then wraped 600 and 1500 grit paper to hone it razor sharp. You can buy long cone shaped diamond stones for under 10 bucks but now ive ordered something better the rubber abrasive cones for sharpening.
I run into that quite often.I know of a guy who is interested in a gut hook, but he doesn't know a ton about knives