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Is the ivory plastic insulator ring installed under the steel disc?? I can't tell from that photo.
You may want to also download the 67 chassis service manual. I think it may show the steering wheel assembly in better detail than the AIM
There is no plastic insulator. Where does it go and what does it look like?
The part is hard to see in the link sent, but look closely and you will see it around the metal spring plate.