For years the routine was the same: Set the clock and snap the setting-knob a couple of times and the clock would come to life. At least for a day of so. Last year it finally stopped for good and I was fortunate to find a wrecked dash with a good clock that has now also expired. I dissasembled one of them and found a main-spring with an arm that settled down on a set of points that fired a solenoid kicking the arm back to thus wind the spring and making that ocasional bzzzt sound that I always wondered about.
The question: Does anybody rebuild those things or is there a more modern remedy to replace that part? Or is there a new clock mechanism that accepts the original face?