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  1. M

    Pendulum rotation varies hourly

    Good idea thanks. I'll try that first.
  2. M

    Pendulum rotation varies hourly

    Links to videos of minimum and maximum rotation
  3. M

    Pendulum rotation varies hourly

    Thanks. I will investigate further
  4. M

    Pendulum rotation varies hourly

    Thanks. I hadn't thought about it that way. I did spin the arbors by hand as I was reassembling, but only all at once and I didn't notice anything untoward. I will take it apart again and check for binding/tightness more carefully. I'll mark the minute hand position relative to the center arbor...
  5. M

    Pendulum rotation varies hourly

    I have recently fixed my first 400 day clock. I think it is an older Haller - it is all metal, no plastic to be seen. It says "Haller" on the dial but the movement just says "Made in Germany". Anyway, having observed the clock for a couple of weeks now, I have noticed that the pendulum rotates...
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