On several previous posts, I noted that some Schatz miniature 400 day clocks (model 53 movement) needed a 0.0024 inch thick suspension spring (whereas the Horolovar 400 Day Clock Repair Guide specifies a 0.0023 inch spring).
I just experienced this again – this week I repaired a Schatz “London Coach” 400 day clock (which has the model 53 movement). The clock ran too slow with a Horolovar 0.0023 inch spring. With a 0.0024 inch spring, it keeps good time.
I measured the thickness of the 0.0023 inch springs, and they are closer to 0.0022 inch thick. It may be that a batch of springs were made too thin, or were mislabeled.
I experienced the same thing with a Kundo miniature 400 day clock this week. With a “0.0023 inch” spring, It needed to have the pendulum regulated almost all the way toward fast to get the clock to keep time. A 0.024 inch spring allowed the clock to keep good time with the regulator near the center of its adjustment.
Conclusion: if a Kundo or Schatz niniature 400 day clock loses time with a 0.023 inch Horolovar suspension spring, install a 0.0024 inch spring.
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- Schatz “London Coach” 400 Day Clock, March 1956 | December 16, 2011