Hey guys and gals;
I started this over on the Classic's forum... but it's pretty basic, so maybe a few more wrenches can weigh in.
I am having trouble with some 80's era Shimano 600 brake calipers staying centered. One member suggested I should have star nuts, or star lock washers, between the caliper and frame/fork. There weren't any there when I disassembled the bike for cleaning, but I can certainly put some in... even though it will eat my most excellent rattle can paint job alive. Hey, as long as it works as nicely as the rest of the bike, which is pretty excellent, I'll be a happy camper.