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The large flat piece between the pawl and the swivel is the cheek plate. In a cuff mechanism, the cheek plate forms the main body that spans between the locking lever (the pawl) and the rotating joint (the swivel). It provides a rigid mounting surface and structural support, keeping the pawl properly aligned with the mechanism and giving the swivel a stable pivot. This plate bears the forces when the pawl engages and when the cuff tightens, making it the foundational part that holds the other components in place. The other parts have different roles: the swivel is the rotating joint, the pawl is the locking lever, and the chain refers to the linking element—not the flat body between them.