This design is a remake of my old design, but this time inspired by Mickey's flightdeck Youtube video:
https://youtu.be/I7Kqpa-pmkg

The use of an MG90S micro servo instead of an inductive load such as a solenoid was genius and in my opinion a massive step forward and now the only way ahead! We can forget about the weak acting and high current solenoids, remove the reverse bias diodes and relays. This design is:

Simpler
Stronger
Uses less current
Does not require a separate different voltage supply

My new design consists of 6 simple 3d printed parts, including the knob. These are quick to print and assemble. You will require some extra hardware, please see below in the component parts section.

The unit can now be affixed to the panel by the same nut used for the rotary switch, it's the imperial version that comes with most switches. Or you can attach the unit by the 4 attachment holes in the upper case assembly.

This design requires a print size of 220mm x 220mm.