How to remove headlight switch

I need to remove the headlight switch (which works fine) in order to remove the panel molding. I need to remove the panel in order to replace the wiper switch.

I've read many descriptions online but none of the suggested solutions work for me. The shaft on my headlight switch is triangular in shape. There is a notch on the knob but there is no tab that I can find that can be depressed or levered to remove it. I can't find a diagram that shows my switch components. If there is a retaining nut as some write-ups have said, I can't find it.