The engagement lever 655 may extend outside of the bay 600 so that a user can access it (see FIG. 9). The engagement lever 655 may be shaped and configured in any way that is convenient and allows a user to actuate it. In some examples, the engagement lever 655 is configured such that the user actuates it by moving it linearly, such as horizontally (see FIGS. 11A-11B). In some examples, the engagement lever 655 may move in the same direction as the second link 653 when being actuated (see FIGS. 11A-11B). In other examples (not illustrated), the engagement lever 655 may move differently than the second link 653 when actuated—for example, the lever 655 may be rotated or moved in a different direction than the second link 653, and this movement of the lever 655 may be translated into the movement of the second link 653 by a gear assembly (not illustrated).
