The two base plates, the adjustment screws (to the left and to the right) and the pivot (far away in the middle). To point the hinge towards the North Star, one first makes a coarse adjustment by extending or contracting the legs of the tripod and turning it to make the scope point as well as possible towars the star. One then adjusts the screws to make the cross hair fall directly on the star. The red backlight of the cross hair is bright enough to make many fainter stars hard to see. This minimizes the risk of aiming at the wrong star, which can otherwise be a problem due to the narrow field of view that the scope offers.