54 at the end of its travel the collar allows space for the rearward ball 62 to move back up out of its hole 54 in the shaft 42 the coil spring 36 inside the connector 20 forces the ball pin 38 forward this in turn forces the rearward ball 62 up and secures the collar in place the ball pin 38 then moves forward thus moving the workpiece 22 to a position where the three centering balls 48 which are tensioned radially inward by the ball spring 46 move off of the drive portion of the hex stem 32 and drop back into the power groove 64 the three tensioned balls 48 hold the workpiece 22 at the power groove 64 with a light grip until the operator selectively removes the workpiece 22 from the connector 20 referring now to fig5 9 an alternate shaft 142 formed in accordance with the present invention will now be described in further detail the shaft 142 of the alternate embodiment is identical in materials and operation as the shaft 42 described above with the following exception as best seen by referring to fig9 the aft hole 154 has been relocated to a position.