One aspect of the invention relates to a composite member for a resonator having an active piezoelectric element and a passive piezoelectric element. The main guide mechanism includes two main rails provided on the base substantially parallel to each other along the first direction, and main sliders sliding on the main rails. The quick releasing shaft includes a hollow body with an outer screwing section, and the hollow body has a slot, an aperture, a stopping rim, an opening, a retaining head, and a shoulder, wherein the retaining head has a plurality of receiving holes. The auxiliary divider produces the divided signal once per cycle and outputs the pulse to the phase detector circuitry.