The parts arrived yesterday so today I made the horn work. The parts #6 from LMC were simply plastic insulators, (Picture 1)
no contacts were with them so I had to fabricate them. First I took an old penny (1979) as they are solid copper where the newer ones aren't, and cut out two squares about 3/16" and then rounded off the corners and polished one side clean for better adhesion (Picture 2)
Then I soldered the 'pennys' onto the worn out ends of the spring loaded contacts which are part of the turn signal switch. This would be a heck of a lot easier to do and much less expensive if your contacts are worn rather than replacing the turn signal switch. (Picture 3)
Then I used the dremel to grind off two small areas of the plastic backer behind the copper discs and soldered about a 3" length of wire to it with a small loop wire connector on the other end and soldered a 6-32 nut onto the loop (Picture 4)
Then I made a contact for the top side on the new parts #6 out of more small loop connectors and filled the wire opening with solder, bent them over onto the contact area and filed them even with the top of the plastic insulators.
Then I inserted a 6-32X3/4 machine screw through the new contact loops and inserted them in place on top of the steering wheel hub, and screwed them into the nuts on the wires connectors
It turned out the new parts #6 were too wide for my wheel so I had to cut them back about 3/16" with the dremel. Then everything went together and works like new.(Picture 5)
Here's a couple pictures of the Bronco with the restored wheel covers and of the engine.