Headlight switch

A less violent method of conquering the usually-balky spring-loaded release button is to tape a penny to your thumb, index finger or middle finger (whichever will give you the most leverage on the release button as installed). The button requires a very hard push; hold it in and give the headlamp knob a hard jerk. You may have to try a few times before it pops out. Make sure you disconnect the battery before you start.

And almost all the factory knobs are not removable from the stems; there's no set screw, no spring clip, no threaded-end-of-the-stem, no nothing. Exceptions are '60-'62 cars and, evidently, whatever probably-aftermarket setup Mullinax95 has in his car.