An integrated circuit having an interconnect layer that comprises a first barrier layer and an aluminum-based layer overlying the first barrier layer. A rotatable hub having a magnet connected thereto is in operable proximity to the stator. The elongated slot has spaced gear teeth defining spaced anchor bar stop or lock portions. The initial values for the engine control parameters are adjusted based on a detected engine performance variable to cause the engine performance variable to approach a target value. The second inside diameter is larger than the first inside diameter. The head portion is shaped so as to provide a resilient force against a flange of the nosepiece when the flange and spring clip are received in a groove defined in the shell during assembly.