I still have several of the truly unbreakable, but unsightly preproduction high-fiberglas-Rambones. Because of the ergo shape, I thought that the Rambone handle would also make a great core for a knuckle duster. However, ring shaped knuckle dusters are banned in Germany... So I simply added three mean spikes to the Rambone handle, from nine inch nails (what else) and blunted/deburred those just enough so they won't damage rubber bands that snap back and hit them. They look mean, and probably work real well, too!