When I bought the 1968 Chevy C10, the previous owner had wired up a new horn to a button he installed where the choke was supposed to be in the dash. I wanted to get the horn working on the steering wheel. In the box of parts he gave me, I found an assortment of stuff that seemed to go with a horn button (according to various diagrams I’d found). Here are the parts as well as what I took out of the steering wheel.
I tried many combinations from the limited info I was able to Google and what I now know are incorrect diagrams in the LMC Truck catalog. Eventually I posted on the 67-72chevytrucks.com forum asking for help. Turned out the metal cup was too short! After getting the proper one and making an extra layer of plastic spacers (see video) I was in business.
Since I had so much trouble finding useful information, I created a video that’ll hopefully make it easier for the next person who tries to do this.