Just make sure you pull the switch all the way "on" first, then push the button down and pull the knob out the rest of the way. Then I think there will be a nut/bezel you have to thread off on the front side
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars