An electrically commutated motor includes a first module to measure a current in a coil of the motor, and a second module to adjust timing of commutation of the motor based on the current measurement. The device includes memory and a control circuit coupled to the memory. In this way, the horizontal growth regions can be formed with high controllability. In addition, the apparatus has at least one adapter moveable element retained within a passage located on the knob and least one drive spindle moveable element retained within an additional passage located on the knob. The controller determines a roll characteristic from the first angular rate signal, the suspension height signal, and the lateral acceleration signal and a pitch characteristic from the first angular rate signal, the suspension height signal and the longitudinal acceleration signal.