English to Japanese Marketing Mechanics / Mech Engineering 時計機構

The balance is the heart of the watch. Together with the hairspring, it is the component that makes the movement keep time.

To remove the balance you must first remove the **balance cock***. To do so, first remove the screw, then place the blade of a screwdriver into the notch at the back of the cock and, with a twisting motion, carefully pry the balance cock away from its seat on the pillar plate. Then, to remove the balance from the cock, you must turn the whole assembly upside down and lay it flat on the bench. Loosen the hairspring stud screw and carefully lift the balance complete off the cock. Some movements have one regulator pin that is bent at it's end or made to cover the hairspring and keep it from coming out of the pins. For this type, you must turn the regulator pin away so the hairspring can be lifted out of the regulator pins.