Here is the wheel all ready to be installed -
And here's the tilt column, only one thing is missing..
At 10:00 on the hub, you can see a plastic sleeve that carries a spring-loaded contactor which brings voltage from the column, through the wheel, and to the pot metal horn bar in the top picture, which is isolated by the red rubber washers.
Before I can install the wheel, I need to find one of these contactors - does anyone know what it is called or where I can get one?