Beyond the balance wheel, other parts may use "cocks" rather than full bridges: : Supports the escape wheel. Pallet Cock : Supports the pallet fork.
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. amateur cock
: 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. Beyond the balance wheel, other parts may use
: The most delicate step is ensuring the upper pivot of the balance staff perfectly enters the jewel hole in the cock. If the screw is tightened while the pivot is misaligned, the staff will break. It serves as the upper support for the
Amateur watchmakers often encounter specific issues when assembling or repairing this component:
: 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.