Can any glasses shop fix my hinges, or am I stuck going back to the place where I bought them?

I have two sets of glasses made from recycled antique parts, which I thought was a good idea at the time. Unfortunately, the hinges (which aren’t antique) on them break. All the time. I’ve had both frames repaired at least 3 times each.

I just realized that the breaking may be accelerated due to the fact that my motorcycle helmet is putting pressure on the frames, so now I feel guilty about going back and having my current frames fixed (my other pair is still there after just being repaired)—on the other hand, each pair broke at least once before I got my motorcycle.

I tried having them fixed when they broke when I was living overseas, but the people at the big chain couldn’t help me.

Do I have to go back to the same people? What happens when I move to SF and they break again?