Determining which direction to move the regulator
Start at the center of the hairspring and follow the coils to the stud. The SHORTEST length of hairspring is at the center while the LONGEST length is at the stud. If the stud is attached to a movable lever, do not move it. This is the adjustment for the beat of the watch and not the regulator. The stud/beat adjuster is located where the hairspring terminates. The regulator is located between the stud and the inner coils.
The regulator will operate on the outer coil of the hairspring. If you move the regulator in the direction of the stud then the watch will slow down; however, moving it in the direction of the inner coil will speed up the watch.
A warning: if the hairspring is tight against the pins and the regulator is moved then it will distort the hairspring.
