Here's a vid I just watched featuring a Brass Knuckles form. I personally like the Japanese yawara as a hand weapon of choice and have a much heavier version made out of solid steel billot, one end flat, the other a solid brass (turning) finial for point strikes. Switch-hand use like a single yawara. Knucks are just sooooo illegal to carry. https://www.youtube.com/watch?v=nD0kWD0JR4g