A cable actuator includes a housing and a cam disposed in the housing. The cam includes a first cable retaining portion and a second cable retaining portion. The cam is movable between a first position in which the first cable retaining portion is in an actuated position and the second cable retaining portion is in a return position, and a second position in which the first cable retaining portion is in a return position and the second cable retaining portion is in an actuated position.

A pivoting mechanism with gross and fine adjustment with a housing, an elongate shaft pivotally retained by the housing, resiliently deformable members retained by the housing, cam members coupled to the shaft wherein the cam members are disposed to deform the resiliently deformable members when the cam members are pivoted, and a locking slide bar for selectively causing the cam members to pivot with the shaft to produce gross adjustments in pivoting resistance. First and second ends of the shaft can act as an output interface for outputting the pivoting resistance exhibited by the shaft to a seat back structure, a seat bottom structure, or some other structure. A threaded rod rotated by a handle can adjust an initial deformation of the first resiliently deformable member for fine pivoting resistance adjustment.