A process is provided for the disinfection of activated carbon. The support outriggers 18 carry a first disc gang 30. In one embodiment, a flexible substrate configured as a generally rectangular panel formed into a cylindrical shape includes a plurality of conductive traces to which the LEDs are connected both mechanically and electrically. Furthermore, the shaft may be bent or otherwise extend at an angle from the shaft engaging member so as to allow adjustment of the shaft position with respect to the club head. The automatic gain control is performed in the analog-to-digital converter downstream of a delta-sigma modulator on an intermediate digital signal sampled at an intermediate sampling frequency greater than an output sampling frequency.