my friend printed up the drive tray, which doesn't use screws and just rests in place with the hollow legs over the screw terminals for the original caddy. it does accommodate the second NVMe stick though.
I may put a lil foam on top of the SSD to smush against the lid and press it a little more firmly into place.
one of the solid legs rests on the CR2032 battery socket, the other on the mobo where there are no SMD components - there are a couple vias, though.
this model was made for the gen4 #EliteDesk Mini, I have a gen5 but those two generations are mostly the same when it comes to the drive caddy. #miniPC #DIY