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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.

: 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. amateur cock

: Mounted on the balance cock, this lever allows an amateur or professional to adjust the active length of the hairspring, making the watch run faster or slower. The balance cock is a cantilevered bridge, typically

: 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 Because it is only anchored at one end