Here is a picture of the horn switch setup. The horn button is not shown, but it aligns with the groove on the horn button retainer.
Left to right under the wheel is the cancelling cam which has the horn brush in it. The horn brush sticks through the steering wheel and contacts the concave washer. The concave washer, (concavity down), is held in place with the nylon insulator which holds the horn button retainer in place.
Hopefully the pic is helpful.
Jim
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