Bill,<br><br>My father claims to have sharpened them in his college days on a piece of glass. I've never tried it, though. A friend of mine, who can sharpen anything, uses a set of ceramic rods with excellent results. I've seen him do it, but it is beyond my skills...I can't sharpen anything, despite years of trying. I use a DMT gadget with an angle holding clamp. It's the only thing that works for me. Never tried it on a razor blade though. DMT makes a product called a mini-sharp; it's just a small (apx. 1 1/2 x 3 x 1/8 inches) piece of plastic and diamond that wouldn't take up much room in a kit. They come in various grits, the extra-fine would seem appropriate for razor blades.<br><br>Hope this helps.<br><br>Ade