I currently have 2 of these Super Course frames in my garage that are identical to your, same color even, and I too noticed the back side of the sleeve through the brake bridge is a fuzz smaller than the bolt, I put a smaller drill bit through it and spun it with a drill while moving the drill in a circular motion and the brake bolt drops right through now.
Last edited by jackbombay; 01-05-20 at 07:30 PM.