Thanks for the vids, but I'll have to say that sharpening 3 blade broadheads on a flat stone only gives you a 60-degree included edge, which is pretty obtuse, and not very sharp. Sure, it'll kill stuff, but not as cleanly as it could. Use a piece of pvc pipe of the appropriate diameter, wrap some wet/dry sandpaper around it and draw (strop motion) your broadhead down it. Increase grit (finer), and you'll have a real sharp three-blade head. You can even wrap leather with compound around the pvc and strop it. I think 1.5" PVC is about right.