I love the MicroPA 100 but I hate the SO-239/UHF connectors, so this small print allows you to swap them out for standard BNC type connectors. The socket for the BNC is slightly off center on purpose so that it visually looks centered on the outside but allows the BNC to still have contact with the main PCB inside.
It's a pretty tight fit for both the BNC and the backplate so you might need to tweak the print settings or file a bit down on the edge of the print.
On the inside I used a washer to keep it secured to the backplate while maintaining electrical contact, and push the ground soldering tab a bit closer to the PCB. I used the AKB washer from Home Depot, but any 3/8in (#10) washer should work.
And of course you will need to de-solder the SO-239 connectors and re-solder the new BNC ones, I'm not great at it but the pads are big so it wasn't that hard. Just be careful of that relay in the back, I accidentally melted the corner off, thankfully it sill works.
The author marked this model as their own original creation.