A transconnector for use in interconnecting a pair of longitudinal spinal rods in a spinal fixation procedure. The sensing circuit may include a comparator that receives a rectified output waveform of a triac dimmer and produces output pulses corresponding in width to the duty cycle of the waveform, and a capacitor averaging the values of the pulses produced by the comparator to produce a set point signal representing a dimming level of the lamp. The invention includes a method of ensuring the proper operation of the credential and a method of protecting the credential from mis-issuance. In the NDBARC material, the carboxylic acid provides the developer solubility, while the alcohol alone, the carboxylic acid alone, or their combination provides the PGMEA resistance. Seen along the direction of the vane’s axis of rotation, the part has an outer outline superimposed on a circle, at the distance of which, and inside which, is at least a part of the outer outline of the part of the platform.