Cock — Amateur

: If a balance wheel stops moving when the cock is tightened, it may be due to insufficient vertical clearance (endshake). Some amateurs resolve this by "shimming"—placing a tiny piece of paper or metal foil between the cock and the mainplate to raise it slightly.

For those interested in the artistic side, historical watches often featured highly decorative, hand-engraved balance cocks (sometimes called "watch cocks"), which are now prized by collectors as miniature works of art. How to fix balance wheel movement issue? - Facebook amateur cock

The balance cock is a cantilevered bridge, typically secured to the watch's mainplate by a single screw. It serves as the upper support for the balance staff—the axle upon which the balance wheel oscillates—enabling the watch to keep time. : If a balance wheel stops moving when

Amateur watchmakers often encounter specific issues when assembling or repairing this component: How to fix balance wheel movement issue

Beyond the balance wheel, other parts may use "cocks" rather than full bridges: : Supports the escape wheel. Pallet Cock : Supports the pallet fork.

: It holds the upper pivot of the balance wheel in place. Because it is only anchored at one end (cantilevered), it allows for easier visibility and adjustment of the balance assembly compared to a full bridge.

: The balance cock also holds the "stud" (the fixed end of the hairspring). Ensuring the hairspring is flat and centered under the cock is essential for accurate timekeeping. Types of Cocks in Watchmaking