It is a side pull single caliper type I think. It rotates clockwise counterclockwise even though I have it as tight as I can get it. I cut off some brake cable length so that it would sit more centered- even so it still swings and sits where it will.
It only has the washer that has the spokes that bite on one side of the mounting hole in the frame, and I was wondering if I should get another one? Would that take care of it?
This group is about a year old, and it has never been right. It really became a problem last night when I was trying to fit a wider profile wheel and keep it from rubbing. By cutting the brake cable down, it's working, but still one side is much closer to the rim than the other and I am not sure it won't rub a little if I am pedalling hard, as when climbing a hill.