Quick Steering Column Question

[saxart]

I have a quick question about setting up a steering column. I rebuilt the column in my truck this past winter and am in the final throws of getting the truck back on the road. The issue we're having is the horn goes on whenever we connect a battery to the truck . After about an hour of testing and research, we've narrowed it down to this...

Here is a pic of the inside of the steering column under the turn-signal switch. See the blue arrow I added to the pic? (I'll get to that in a minute)



Now here is a pic of the back-side of the turn signal switch.



See the RED arrow? This spot is grounding out on the previously mentioned spot with the blue arrow inside the column. The minute I remove the screws holding the turn switch to the column, and pull it away, the horn goes off.

Is there supposed to be some sort of insulation between these two pieces? On the front side of the turn signal switch is the plunger that rides on the back of the turn signal cam. With the switch removed like this, I can take a scrap piece of wire, touch it to the switch plunger on the front, and ground it on the steering shaft to make the horn honk. (Which is how the horn button works.)

As silly as it sounds, I'm thinking of just putting a small piece of electrical tape on the back of the switch (near the red arrow) and reassembling it. The horn button should then activate the horn. It seems wonky, but also seems like it would work.

What are your thoughts on this one?