I've been using a ceramic rod that I got from work out of a burned-out industrial overhead light fixture. It's the part of the light that glows. It's relatively short but it works great. I've been using the same one for years for knives and just recently started using it for bheads. Works equally as well for bheads as it does for my knives. I just screw in one of the bheads to the end of a broken off, short section of aluminum arrow and run it across the rod like I was shaving a thin layer off of the rod. First one side, pulling towards me, then the other side, pushing away from me. Gets'em sharp for me.