Bill ,
On the sixty one unibody f100, I have the need for the horn wire that runs up the steering column and screws into column head stamped with engineering number CODF-3511-AW.
If I remember correctly it has a nylon head where it attaches, with some sort of copper pin and spring, that makes contact with the bottom of the steering wheel.
I have three of these column set ups in my trucks but cannot come up with the info. The turn signal switch actuator is all steel not the plastic kind