Finding solutions to problems is what I do (at work).
So when I had Shadow 2 OR plate screws loosening up with high volume shooting despite loctite, I came up with this idea and it has worked so extremely well that I wondered why it wasn’t a thing.
I thought you’d appreciate the elegance to it. It just makes more sense than putting all the marbles on two little post screws.
This is what I’m using currently.
I also use it as a “cap” on screws and things that would vibrate loose otherwise too.