In my Pulsar Buddy project I just used standard machine screws.
Metric 18-8 Stainless Steel Extra-Wide Truss Head Phillips Screws, M3 x 0.5mm, 16mm long.
I got them from McMaster, along with matching zinc-plated steel hex nuts:
For my board, I just put down a plated through hole just big enough to take the screw – and with copper as wide as the screw head on both sides. No fuss mounting – just tighten with a screwdriver!