The vibration should be equal at the slightest oscillation of the balance as well as during the longer arcs. The coil should not rest against one or the other of the pins at any time unless they are both closed. Emphasis is placed upon equal vibration of the coil when the pins are open because of its importance, and if results are not obtained (as expected) the examination should be repeated to see if correct conditions have been attained. Examination of this vibration should be made from both sides of the pins and usually the best estimate can be obtained by looking between the pins from the stud side.
[39.]Position Corrections Obtained by Spreading or Closing the Regulator Pins.
When the regulator pins are tightly closed and the watch has a fast pendant up position rate, it will be possible to obtain a slower rate by slightly spreading the pins.
When the pins are spread and vibration of the coil between them can be discerned, and the pendant up rate is slow, a faster rate can be obtained by closing them.
In spreading the pins they should be drawn away from the coil equally, as otherwise the coil will strike one pin with more force than the other, which will not produce results as expected and will cause uncertain regulation. In closing the pins they should be drawn together one at a time until both are in equal contact. They should not be merely squeezed together, as this causes distortion of the coil at the point of contact.
CHAPTER X
FACTORY AND REPAIR SHOP ADJUSTING
[40.]Routine Varies According to Circumstances.
The principles covering the adjustment of watches are the same in the repair shop as they are in the factory and they are equally the same in the various lines of high grade watches regardless as to whether they are of American or foreign extraction.