Yet another horn problem

[Chevystep]

Here ya go-66 Chevy ...

Relay good-power it up, case ground it, and then ground the black wire relay and it clicks and sends 12v to the green wire (horn) terminal.
Horn-send 12v directly to the terminal while mounted/grounded to rad support, it honks.
Black wire at column brass horn plate behind wheel has continuity to black wire out at the horn relay, no breaks there.
Horn button has continuity when checked between brass horn button bushing on back and steering wheel center when horn button is pushed.

So??? Can someone give me another test continuity or 12v or other to check? Shouldn’t test wiring between steering column shaft and brass horn ring make the horn honk? Should the steering column shaft be a ground? Or does it lose it through the rag joint? Yeah....I’ve been messing with this too long and my thinking may be fuzzy....