One of my ball trough screws keeps backing out. Kinda similar to this old post: https://pinside.com/pinball/forum/topic/stern-smve-ball-trough-issues

On this image the far right black screw that's "recessed" in the cut-out will pop out. I put it back in and it well eventually work its way out.
Screw, screw, screw
I think part of the issue is I can't find a small enough 3/16 inch socket to get the screw tight enough as my current sock or nut drivers are too "thick" to clear between the screw end and the recessed metal. I can't even get any of the other recessed screws out with this:
20200604_155554000_iOS (resized).jpg

Thoughts? Is there an ultra low profile nut driver that will work better?

If it backs out again I'll put some blue loctite on but just curious on a proper tool to use on them...

You are right, there was just a hair of the screw sticking above the metal that I guess the bevel in my socket wasn't catching. Sadly don't have that wrench (had a 7/32, doh), so got a cheapie on order. Thanks!