A system and related process to enable control of photolithographic pattern features on a structure having one or more severe non-flat topologies. The yarn assembly can be formed by drawing a longitudinally extending core for the yarn assembly through a concentric core-spinning zone, and, as the core travels through the core-spinning zone, twisting at least one ribbon of multiple nanofibres about the travelling core. An organic electroluminescence device being composed of one or more organic thin film layers having at least a light emitting layer sandwiched between a pair of electrodes wherein at least one of the organic thin film layer contains the metal complex compound. At the same time, the dynamic characteristics of the golf club are also measured, including the golf club head velocity.