Teardrop Rivet Rack Holders

There's a shelving slotting system that goes by either the name rivet rack or teardrop rack. I have a shelf that exposes them outward, and figured I could get some use from them by making utilities that interlock with them.

Demo video at https://youtu.be/VF9v49x1sic

An interlocking platform was designed that vertically hooks into two keyholes for stability and features a plug that prevents the things from being accidentally lifted out. The plug is connected by a flat-ribbox flexure, which moves in a constrained way when the utilities are lifted up and down. But to be inserted/removed, they must be pushed inwards/outwards, which can only be done manually with intentional manipulation.

I'm not sure if there's a teardrop rack standard that all shelving systems comply with, but these are compatible with multiple shelves I have from different manufacturers.

# Printing
The models can be printed with a brim if needed, but it's recommended not to use one unless necessary. This is because s