You might want to verify the installation kit part#. This is the one I’m using on my 67 as called for in Grants chart, which has the copper foil on the backside of the splined adapter that the horn roller contact rolls on.
Or are you using a different steering column?
View attachment 1716090733
Im using a Joe’s Racing steering wheel which I had to drill to fit the Grant #4315 but haven’t got around to getting the horn hooked up atm.
View attachment 1716090753
