A method for driving a data signal across a data bus consists of charging the data bus to a first voltage level prior to driving the signal, maintaining the data bus at the first voltage level when a first type of data signal is to be driven, and pulling the data bus to a second voltage level when a second type of data signal is to be driven. This shape change may result in changes to the overall center of gravity, weighting, andor moment of inertia characteristics of the club head. At least one or a pair of bores extends from the front surface into the seatback. The pump is attached to the fan and driven by the fan.