A compact and aesthetically-pleasing self-closing door hinge comprises a gravity-assist feature and preferably a spring-assist feature, wherein the spring may be easily adjustable, replaceable, and even left out of the hinge. The conveyor system shown comprises a main, or trench, conveyor flanked on opposite sides by opposing groups of tire presses. The enlarged handle portion may be secured to the upper loop handle of existing scissors or scissors may be manufactured with the enlarged handle portion included rather than or in addition to the normal loop handle. Post also has one or more contact surfaces. The present invention also provides an efficient method of manufacturing the organic EL device.