I am in the process of replacing the horn parts of the steering wheel in my 67 Camaro. I ordered a repair kit for the horn and when it arrived it had all the parts I expected but it also has something I did not find on my car when I removed the horn cap. I received a rubber "donut" for lack of a better term, that appears to be something that is installed onto the back of the horn cap. Is this a true statement if so, what is the purpose?
dab67