Does anybody know whether or not two-finger rings can be regarded as "brass knuckles"? I was thinking of making myself some of these: in my university's machine shop using a CNC mill, since I can get 1/8" aluminum or stainless steel pretty cheap. Problem is, brass knuckles are illegal in MA, and I don't know whether rings like these are legally regarded as such. Also, would anybody be interested in a ring like this? I can make them for less than half of what S2A costs.