As a preamble....I have limited clock repair training but have played around with it for about 8 - 10 years and one of the clocks that got me started was the Hammond synchronous. The simple but accurate time keeping design grabbed my interest. Electro-mechanical clocks remain my major focus but I am working on expanding my knowledge now that I have retired and find the NAWCC to be an invaluable resource. I am very much hoping the National Convention is still able to take place in June (becoming less optimistic I'm sad to say!) as I am looking forward to gaining additional clock repair knowledge. The question I have is......sometimes, after cleaning and repairing a Hammond clock, the motor can sometimes be noisy and the spin to start doesn't want to catch like it does in the majority of my clocks. It's like there is resistance somehow. The mechanical aspects of the clock are perfect as far as I can tell. Could it be a polarity issue? My Hammond mantle clock is having these problems and I could live with the minor running noise but I find the clock is stopping once or twice a week and, as I mentioned, starting is not as smooth as I know it should be. What can I test or check to try and correct this? Would replacing the coil be a start even though it appears not to be damaged? Any guidance anyone could provide would be greatly appreciated.