JohnSL - Random Products | A Threaded Watch Back -- Tiny and Tricky Threads @JohnSL | Uploaded March 2023 | Updated October 2024, 2 hours ago.
Making a threaded watch back with tiny and tricky threads was not easy. I needed room for an O-ring as well, so there wasn't a whole lot of room for threads. I didn't get a working version the first time around either.

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* Part 1: youtu.be/WsUpLqfBhVM
* Part 2: youtu.be/z5yi1x_k4_I
* Part 3: youtu.be/ZdXsC1bjBbQ
* Making Tiny Custom Threads for a Custom Watch Back: youtu.be/sXuVPorVPt4