Watch winder - three positions

Hi. I wanted to share my new project with you today. I have several automatic watches that are constantly lying motionless. While looking through users' projects, I came up with a new idea to create a rotary trigger - three positions. The device works :-). The motion system is based on the well-known Arduino Uno. One 28BYJ stepper motor with ULN2003 module is used. For the assembly I used M3 screws (length 12mm, 22mm). The rotary mount is installed on a 5.1x3.4mm pin. The project may have minimal shortcomings :-). In the holder embedded in the mandrel, you should make larger holes so that the nut head hides - I corrected this with a screwdriver :-). I recommend the project for etuzijasts of watches. Greetings
And the holes in the housing. Initially I was thinking of using the power supply through the usb port - still left. The first open slot - the point for the switch, the second for power.
Regarding the aforementioned project. The rotation of three watches caused some problems - to