Technical 1941 Chevy Fog Light Switch

Any suggestions on how to remove this fog light switch gently?








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Any chance that there is a miniature set screw on the side of the knob?

 

Dang I couldn't do that again on a bet, It's an Arc Les switch. Here is one on Ebay. You will have to put the number in the search.
eBay item number:
324141954476

This is the informational link though it shows the switch apart and I'd say that the knob that has a light bulb behind it just pulls offhttps://www.ebay.com/itm/ARK-LES-FO...-Buick-Ford-GM-Mopar-dash-light-/283841333129

 

Pull the knob off. The retaining nut is under it. Should be a #51 bulb in there, too ...

 

thank you guys!