71 Dart horn

inside the rubber band on the inside of the wheel are two flat metal bands that are held apart on the edges. When you squeeze the wheel (thumb on inside fingers on outside) it presses the two metal bands together and the contact blows the horn. I think someone makes a kit to replace the rubber and metal bands if that is what is wrong.

If you get too frustrated and want to ditch the rimblow, I'll buy it from you.