Screwing down leaf switches

Depends on the application. Type of game, company, title, era. #4 round head phillips are pretty common. Length is dependent on the housing or base being used. I've seen #6 used on games before. Specifically pins, shuffle boards, puck bowlers.
 
Not sure on Williams of that era. Is there a plastic housing it mounts in at all or is it just stacked with plastic or wood spacers? Long or short buttons will determine length and amount of spacers needed. I'd guess they are #4 round head if at all similar to those that mount into the bakelite squares and use plastic spacers as the holes.
 
The old Williams pinball catalog calls out for a #6 x 1" wood screw for a standard leaf switch stack. PBL sells the same p/n as a #5 x 1" wood screw. Either would work fine.
 

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Yeah, I think you just buy a bunch of lengths of #4 and #6 panhead screws and go from there. I think I have at least three lengths of both size screws for this very reason. Sometimes you can put the leaf directly to the control panel, sometimes you need spacers, it all depends on the thickness of your control panel and the length of your buttons.

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This model works great. Have them on all the switches for my multi Williams, with long shaft push buttons. If you don't have access to a 3D printer, check to see if there's a library or maker space around that will print them for you.

 
Look like "round head" screws if you want the same head type, though other head types would work.

You can buy a device like this cheap to learn the length and diameter of the screw:

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For me, I just bought a massive hoard of hundreds of different types a while back so I always have what I need on hand (wood screw trays not shown in this pic but you get the idea):


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