awesome!
seeing your pictures reminded me of mine... and how I felt like Charley Chaplin in "Modern Times", turning that rod once per minute.
I had followed advice on the web - and glued a CD on a washer and the washer onto a nut which was screwed on the rod.
Onto the CD I glued a white piece if paper with the 5 minute steps of a clock drawn on it. (Black felt pen on white paper: nicely visible in the dark.)
Turning the CD while listening to your timer app could be another improvement for accuracy?
Please, post some pics of your captures!