Watch winder for a single watch.  It's a remix of a double done to accommodate a single watch.

All parts per the original design except as follows:

• New base (modified for a 5.5x2.1 power jack I had, plus a smaller power switch (NKK HB16 series that I also had) 
• New bottom cover (to match the new base)
• New single outer ring

I used an Arduino Pro Micro (that I had on hand), so there are no mount holes for the Arduino.  Code not attached here, as it's the same as the original, just with the second output commented out and adjusted for the Pro Micro pinout.

Remaining credit to @JayS for the original design.