| 摘要 |
A device 1, for rotationally driving an element 15, including a rotationally-driven member 39 at a front of the device and engageable with, to transmit rotational drive to, the element. A formation 43 is shaped to contact, to transmit a reaction torque to, 5 an attachment 33. A rearward-facing portion 59a is at the rear, or rearward, of the formation. An arrangement engages, to act between, the rearward-facing portion and the attachment to rearwardly urge the attachment. |
