{Collins} How to remove large Loading & Tuning Knob Collins 30S-1 front panel

I'm slightly confused about removing the the loading & tuning knobs, I do not see any set screws .
I have the others off with a Bristol Wrench and have the screws removed from top and bottom of the case.
Do these knobs just pull off ? I gave a light tub but nothing ? Nothing in the manual .
What is the secret ?

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