Disclosed are pivoting structures and methods of pivoting structure. The pivoting structures can include a movable shutter plate including an aperture, pivotally fastened to a supporting plate by the pivot pin, and having a slot that receives a slot pin of a rotator, the movable shutter configured to move across the rotator as the first housing and second housing change their orientations with respect to one another. In a particular position, an aperture of the moveable shutter plate is aligned with an aperture of the first housing.