Summary

I made a different switch with reed relay. On the bottom I added a box for the battery so it is no need for a screwdriver to change battery.

Servo:
https://hobbyking.com/en_us/hobby-king-s0361-3-6g-45kg-12sec-micro-servo.html

https://www.youtube.com/watch?v=VaIZJO7auJg

https://www.youtube.com/watch?v=uY7Nns3xyA0

https://www.youtube.com/watch?v=nhoG5N7iRAI&t=29s