A process for producing a tetrahydrocarbylaluminate is provided. The bladder contains a flowable media such as a fluid or gel which is heated or cooled so as to be able to control the temperature of the work bench work surface. Each rate gyro signal indicates a rate of rotation about a respective axis associated with a particular rate gyro. A fixed pick-off comb is interleaved with a portion of the second comb of the proof mass.