Have any of you other knife makers made any seat belt cutters or rescue tools? Im making a couple mini keychain seat belt cutters right now and am going to start a larger belt cutter and glass popper tomorrow. Im wondering how to go about sharpening the belt cutter. I guess it would be the same as sharpening a gut hook but ive never done that either. Dad said to try a chain saw sharpening bit in a dremel. Any other ideas? Right now im using sand paper on a chainsaw file which works but is super slow.