be actualized by the view of the hinge ratchets and brackets shown in fig2 four apertures 38 of which only two are shown in fig1 are located on the fixed mount bracket 30 are employed with mechanical fasteners to fix the entire assembly to the stern deck fig5 also shows fixed cushion 78 which is also attached to the deck proximal the rear of the boat arrow 85 shows the orientation of the movable cushion 76 and fixed cushion 78 with respect to the front of the boat or other craft the present invention is a hinge system for a cushion seat back on a boat which may be used for water skiing having a shaft with a first end and a second end where the shaft first end is connected to a bracket where the bracket is affixed to a cushion seat back and the cushion seat back is initially in a flat position at the rear of the boat the shaft second end is secured by a locking key in a central aperture of a main gear this main gear having a radius and a circumference as well as a plurality of teeth equally distributed radially outward about the circumference of the main gear a plurality of apertures pass through the main gear these plurality of apertures are equidistant from one another and the plurality of apertures are intermediate the central radius of the main gear and the plurality of teeth which radially surround the circumference of the main gear the hinge system of this invention further includes a.