On occasion, you might find after strenuous work or even a small bump, that the sub-dials do not perfectly re-set. This is a safety mechanism built into all chronographs so as not to damage the "teeth" of the wheel. Should this happen, there is a function to re-set the second hand sub-dial. Chrono function STOP Pull the crown out (same as if you were adjusting the time) Press the top button in, the second hand will turn fast in the opposite direction a. If you release the button after, you can adjust second by second b. Press the bottom button in, the second hand will turn fast forward c. If you release the pusher after you can adjust second by second