{Collins} Stuck Knobs...help!

Hello All...
  I'm new to the list and hope that this question hasn't been driven into the ground....
  I am restoring an 75S1 and can't figure out how to get the knobs off. There is no set screw (on most of the knobs). I've tried pulling them off but they are much too tight.
  Is there a "trick" to this?  How do you get these knobs off, without risking breaking them?
  I sincerely appreciate any help.
  Wayne K7NCE

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