I have a New Haven no 1 , 8 bell, labelled westminster but acutually whittington chime,1 gong clock circa 1895 that I have been trying to restore for the last 10 years. The case was missing all the top molding and other parts of the case, no dial, missing hands , no pendulum and VERY Dirty. I cleaned, oiled, and threw on a pendulum. It would tick a few minutes and then stop. Cleaned and oiled again , it then ran for 24hrs. Started the pendulum again and it would only run a 10 minutes and then stop. Could not find anything wrong . Every pivot, tooth and beat looked and sounded fine, the mainsprings still had lots of power . Totally expaspearated so put it away but every year I would work on it again for a week or two with multiple cleanings and sometimes it would run for day but mostly only a few minutes. Repeat this every year for 10 years and finally a member here 3 years ago suggested the typical pendulum for a New Haven was a 2.5-2.6 oz pendulum , Timesaver part xxx. After several more years of cleaning and oiling and more Exasperation, I finally ordered the suggested 2.5 oz pendulum . It`s now been running 48 hours!!! Amazing !!! I had been using a 4 or 5 oz pendulum . I didn`t think it mattered as I have had to guess on pendulum size and weight for other missing pendulums and never had a problem. And especially when the clock ran a couple of times with the larger and heavier pendulum a whole 24hrs. At least it`s running and now I can glue back all the hair I pulled outta my head in frustration..
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