A non-planar surface may be surface mounted to another surface using solder balls that may be modified to generate a planar surface for receiving the second surface. A control signal is produced by multiplying the disturbance compensation signal by a gain adjustment coefficient. An inlet opening is located between the interior and exterior surfaces above the outlet passageway. The tubular structure is housed in an outer housing which encases a bicycle crank or fits within a specially designed bicycle crank. A message is built from information contained in the message control block or transferred to the processor or co-processor.