Pcb etcher (shaker)

I couldn't find any PCB shaker that would use sg90 servo, so I made one with ability to "fish" the PCB out after it's done etching
if you want to build this, you would need:
- SG 90 servo
- Microcontroller capable of driving the servo
- Screw with diameter of 8 mm, length of 75 mm with at least ~50 mm of smooth zone