My '57 big bolt has an original style if not THE original headlight switch. I had trouble finding the release button also, turns out the button was stuck in the "in" position and once I put more pressure on it I was able to remove the knob. I ended up taking the switch apart and cleaned and lubed it, has been working well since.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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