Clock movements are really very simple, when you compare them to electronics. Brass clock movements are generally not influenced by all but the most extreme static electricity, temperature fluctuations, humidity changes, or magnetic fields. Once all of a clock movement's wheels have turned 1 revolution, there is no reason why they shouldn't keep making those revolutions for at least 2 years time without service unless some physical change has come to them. Unless it has been moved or jostled there is no reason to expect that any modern mechanical clock should develop any new problem after a week's worth of good running. If your clock stopped working properly "out of the clear blue sky," take a moment to double check the following: 1. "Is the clock hanging straight?" Forget about how straight the clock looks on the wall. Use your ears. You should be listening for an even TICK TOCK ( listen ) sound. If you hear an uneven tick TOCK or TOCK tick ( listen ) s...