A power take off arrangement to open/close a chuck for a power driver, the PTO arrangement comprising: a chuck actuating shaft, characterized by a coaxial PTO actuator shaft axially displaceable along, yet rotationally locked together about, a first axis of the power driver; an input shaft, supporting jaws of the chuck, and concentric to at least a portion of the chuck actuating shaft and a portion of the PTO actuator shaft; relative rotation between the chuck actuating shaft and the input shaft selectively being prevented and being caused by first and second configurations of the chuck actuating shaft and the PTO actuator shaft, respectively; and a PTO-control member, displaceable between first and second positions along a second axis parallel to the first axis, and coupled to adjust at least one of the chuck actuating shaft and the PTO actuator shaft to achieve the first and second configurations, respectively; an Nth stage of a transmission including a sun gear, a carrier, planet gears and a ring gear; the sun gear selectively being directly engageable with the PTO actuator shaft; the carrier being rotationally locked to the input shaft and selectively directly engageable with the PTO actuator shaft; and the ring gear being selectively directly engageable with the carrier; wherein, in the second configuration, the following is true: the sun gear is directly engaged with the PTO actuator shaft; the carrier is disengaged from the PTO actuator shaft; and the ring gear is disengaged from the carrier; and wherein, in the second configuration, at least one of the following also is true: the PTO-control member directly engages the carrier to disengage the carrier from the PTO actuator shaft by the PTO-control member; and the PTO-control member directly engages the ring gear to disengage the ring gear from the carrier. a chuck actuating shaft, characterized by a coaxial PTO actuator shaft axially displaceable along, yet rotationally locked together about, a first axis of the power driver; an input shaft, supporting jaws of the chuck, and concentric to at least a portion of the chuck actuating shaft and a portion of the PTO actuator shaft; relative rotation between the chuck actuating shaft and the input shaft selectively being prevented and being caused by first and second configurations of the chuck actuating shaft and the PTO actuator shaft, respectively; and a PTO-control member, displaceable between first and second positions along a second axis parallel to the first axis, and coupled to adjust at least one of the chuck actuating shaft and the PTO actuator shaft to achieve the first and second configurations, respectively; an Nth stage of a transmission including a sun gear, a carrier, planet gears and a ring gear; the sun gear selectively being directly engageable with the PTO actuator shaft; the carrier being rotationally locked to the input shaft and selectively directly engageable with the PTO actuator shaft; and the ring gear being selectively directly engageable with the carrier; wherein, in the second configuration, the following is true: the sun gear is directly engaged with the PTO actuator shaft; the carrier is disengaged from the PTO actuator shaft; and the ring gear is disengaged from the carrier; and the sun gear is directly engaged with the PTO actuator shaft; the carrier is disengaged from the PTO actuator shaft; and the ring gear is disengaged from the carrier; and wherein, in the second configuration, at least one of the following also is true: the PTO-control member directly engages the carrier to disengage the carrier from the PTO actuator shaft by the PTO-control member; and the PTO-control member directly engages the ring gear to disengage the ring gear from the carrier. the PTO-control member directly engages the carrier to disengage the carrier from the PTO actuator shaft by the PTO-control member; and the PTO-control member directly engages the ring gear to disengage the ring gear from the carrier.