A mounting system for an interface such as a flat panel display such as a computer monitor or television allows the display to be pivoted about a virtual pivot axis which passes through a center of gravity of the display. The curvic coupling design includes a compound fillet radius, comprised of a large and a small radius, located between the root and the pressure surface of all splined teeth on the torque transmitting coupling halves. The DDR test interface allows the tester to interface to test circuits within the device, such as IEEE 1500 andor IEEE 1149. The surface can then be finished, and no priming is required.