A retainer assembly includes at least a front section, first and second sides, rack brackets, rack pins, a gear, a latch, and a user interface. The front section forms apertures. The rack brackets extend through a respective one of the apertures formed in the front section. The rack pins extend across the first side to the second side. The rack pins assist in coordinated movement of the rack brackets. The gear is located between and contacts the rack brackets. The gear is configured to laterally move the rack brackets. The latch is moveable from a first position to a second position to assist in preventing or inhibiting movement of the gear. The user interface is configured to move the gear.