How to properly adjust a pendulum clock?

Posted in Clocks by admin on May 4, 2009 2 Comments
clock
Edward asked:

I’ve got a wind-up pendulum clock (says “Regulator” on the glass) that doesn’t keep the right time. You can adjust the bob’s distance by turning a nut. Does anyone know how to precisely synchronize these things or point me to instructions? There has to be a better way than trial-and-error.
The length measured from what two points? Center of mass to the axis if rotation?

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