I found a pair of M Frame 2.0 glasses on the ground, and it looked like they had gotten pretty beat up. I put the lens back in, and cleaned them up but I noticed the little clip at the top/center of the frame is broken. It will not stay clipped on. I know this is not much of a functional problem, but the little hole at the top of the lens is showing. Is there anywhere I can get a replacement part? I can find replacement lenses, but not that little clip.