Removing horn button 1937 ford coupe

[Blindhuckster]

Can anyone tell me the proper way to remove the horn button without damaging it on my 1937 Deluxe Coupe. I reworked my horns and they are both working when tested with jump wires from the battery. Some of the wiring has been worked on in the past. I'd like to get the button off to check continuity down to the center post on the headlight / lightswitch body housing and the button contact. Thanks Nate Anello