I am using the active pawl from Hoppy's mods and the original static pawl. I found Hoppy's pawl more reliable, but his static pawl put too much weight on the ratchet wheel and cause it to miss some ticks. I still have work to do on the static pawl selection.
I made the pendulum shims thicker. I think the issue here is that I printed the base and frame with a 0.6mm nozzle and 0.4mm layers to reduce print time, and consequently the feet sit fractionally higher.
The pendulum mechanism had the number 5668 on it, ordered from ebay. I believe it is the same circuit with SMD transistors. I also tried one labelled 12888. It did not work well, and it seems to have less power. The circuit is quite different: it uses only a single transistor. The battery cover won't sit quite flush with the 5668, so I added some stick-on feet to make the base sit better.
The minutes hand was too loose and so I tweaked the STL.
Not yet tuned! I take inspiration from a video by the curator of clocks of the British Museum, who talked about clocks that you bring out to show off on special occasions rather than using them as regular timepieces.