Stuck headlight switch/ replacement pull knob

cudajim - thanks for your input, but there is no leak above or near the switch.....I think where the problem arose is from there being water/dampness in the car for a long period of time from a leaking quarter window seal. Every time the water evaporated, it has to go someplace - usually up. When it rose up under the it then condensed on whatever is under there. The headlight switch having a nice cool plate above the switch rheostat and pull shaft was a great place for moisture to collect. That's my educated guess...… something to be said for heated, dry storage!

RT