How to pull the Auto Pilot control knob off?

Hey Gang,
Im new to the forum, and I'm a new owner of a 65 Imperial. I need to replace my ignition lock cylinder. I've got the metal plate lose that frames all the controls in that area of the ignition/auto pilot/. It's loose and ready to come off, but I'm having difficulty getting the Auto Pilot control knob off so I can remove that metal plate piece and get to the ignition cylinder. I thought maybe I just pull it and it'll come off ...but with some pressure it isn't budging and I'm afraid...

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Author: Ambush