A seat height adjustment actuator, comprising: (a) a brake drum for fixing to the seat, and defining an outer brake race around an opening through the brake drum; an output component including: (i) a brake hub rotatably receivable in the outer brake race, and defining an inner brake race complementary to the outer brake race; and (ii) a pinion integrated with the brake hub, and configured to extend through the brake drum opening to engage a seat adjustment mechanism; (b) a plurality of rolling brake elements between the inner and outer brake races, for locking the brake hub relative to the brake drum in the absence of an actuator input; (c) a clutch assembly including: (i) a clutch drum configured to rotatably cover the inner and outer brake races, defining an outer clutch race, and having a plurality of clutch tabs configured to extend between the inner and outer brake races for displacing the rolling brake elements to unlock the brake hub in response to an actuator input; (ii) a driver cam rotatably receivable within the outer clutch race; the driver cam defining an inner clutch race complementary to the outer clutch race; the driver cam configured for coupling to a handle to receiving an actuator input; and (iii) a plurality of rolling clutch elements between the inner and outer clutch races, for transmitting an actuator input to the clutch drum and permitting rotation of the driver cam relative to the clutch drum in the absence of an actuator input; and (d) an exterior cup fixed to the brake drum to define a housing enclosing the output component and the clutch assembly; the exterior cup having an opening therethrough. (a) a brake drum for fixing to the seat, and defining an outer brake race around an opening through the brake drum; an output component including: (i) a brake hub rotatably receivable in the outer brake race, and defining an inner brake race complementary to the outer brake race; and (ii) a pinion integrated with the brake hub, and configured to extend through the brake drum opening to engage a seat adjustment mechanism; (i) a brake hub rotatably receivable in the outer brake race, and defining an inner brake race complementary to the outer brake race; and (ii) a pinion integrated with the brake hub, and configured to extend through the brake drum opening to engage a seat adjustment mechanism; (b) a plurality of rolling brake elements between the inner and outer brake races, for locking the brake hub relative to the brake drum in the absence of an actuator input; (c) a clutch assembly including: (i) a clutch drum configured to rotatably cover the inner and outer brake races, defining an outer clutch race, and having a plurality of clutch tabs configured to extend between the inner and outer brake races for displacing the rolling brake elements to unlock the brake hub in response to an actuator input; (ii) a driver cam rotatably receivable within the outer clutch race; the driver cam defining an inner clutch race complementary to the outer clutch race; the driver cam configured for coupling to a handle to receiving an actuator input; and (iii) a plurality of rolling clutch elements between the inner and outer clutch races, for transmitting an actuator input to the clutch drum and permitting rotation of the driver cam relative to the clutch drum in the absence of an actuator input; and (i) a clutch drum configured to rotatably cover the inner and outer brake races, defining an outer clutch race, and having a plurality of clutch tabs configured to extend between the inner and outer brake races for displacing the rolling brake elements to unlock the brake hub in response to an actuator input; (ii) a driver cam rotatably receivable within the outer clutch race; the driver cam defining an inner clutch race complementary to the outer clutch race; the driver cam configured for coupling to a handle to receiving an actuator input; and (iii) a plurality of rolling clutch elements between the inner and outer clutch races, for transmitting an actuator input to the clutch drum and permitting rotation of the driver cam relative to the clutch drum in the absence of an actuator input; and (d) an exterior cup fixed to the brake drum to define a housing enclosing the output component and the clutch assembly; the exterior cup having an opening therethrough.