I can’t answer your question, but that playfield looks awesome.

Cut the clear completely away from where the pop threaded screw nail goes in using a fresh drill bit by hand. Don't pound it in, either, you're better off drawing it into the PF from tightening a nut. Get some extras because sometimes they snap when you do this.... downside of harder plywood ply on the repro playfields.

Non-flush screws won't work they'll interfere with the activation platter, and you'd have no way to tighten them anyway. You MIGHT be able to use a Gottlieb style base plate underneath, I haven't explored that option yet. That would avoid the somewhat annoying finned pop screw nails. Mata Hari is on my list swap as well, but there's a couple other games in front of it that I should finish, and a couple that need to be set up. (As well as a couple prep for sale, for whenever the next show might happen in 2021....)

Is this a CPR PF? I assume it is. I use a caliper and drill the hole slightly smaller than the nail. I use a counter sink drill bit and drill a hole about the size of the nail head. I do hammer it in and use flat punch slightly smaller than the nail head to drive it in flush. I've done about 10 of these and have never had a problem. Feel free to contact me if you have other questions. Good luck.

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I use these diamond bits for a dremel. You can buy a kit from Ron Kruzman

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+1 on the dremel bits

I hate to be negative, but they will probably fall out. I'd say that's why there are through-hole fasteners like the pop bumper screws to begin with

The diamond bits are easy, especially will a variable speed Dremel set to low speed.