A tool includes a transmission mechanism, a shaft rotatable relative to the transmission mechanism, and a stop mechanism associated with the shaft, the stop mechanism being transitionable between a first state and a second state. In the first state, the shaft is free to rotate in a first direction and in a second direction opposite to the first direction. In the second state, the shaft is constrained from rotating in one of the first direction or the second direction by a defined first endpoint of a range of rotational motion of the shaft. Devices and methods relate to rotation stop mechanisms.