An article of manufacture is provided which includes a molded piece-part having a substantially rectangularly-shaped plate portion including opposed surfaces. The piece-part also includes a pair of elongate parallel-spaced rack gear portions depending from one of the surfaces of the plate portion. The article further includes a member made of a resilient material having an inner surface facing the other of the surfaces of the plate portion and fixedly attached thereto. Moreover, the member includes a plurality of intersecting channels extending into the member from the inner surface thereof.