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In the case of our older mopars there is a moveable mechanical arm that contacts the hairspring for added or reduced tension. This arm is designed to move in the direction needed during manual time corrections. It may take a number of adjustments until the wheel speed is correct.
From the several that I have worked on the intervals vary. As long as the points open and keep the balance wheel oscillating it will run. These were made that with time correction via adjusting knob it moves the regulator in the direction needed to speed up or slow down the balance wheel, but...