Hi,
I just got a clock in to work on with a broken mainspring. A Hermie 351-021 marked for a 55cm pendulum. Anyway as I was searching for a spring I saw several of the same model movements calling for different pendulum lengths. I just became curious as to how this is. I'm assuming the parts are interchangeable so why would the pendulum lengths be different? Is the weight of the bob different? Or would it be a difference in the leader?
Thanks,
Charles K