A composition comprising a polymer mixture A of polymers formed by:. The piston chamber can therefore utilize space adjacent the structural member to which it is mounted thereby resulting in a piston chamber of a greater volume than prior art designs. The liner lip has four corner holes receiving the four corner dowels. The switch combines the vertical component of the first polarized beam and the horizontal component of the second polarized beam to produce an output polarized beam. Alternately, the divider may be rotated substantially parallel with the frame section so as to be positioned in a stowed location. Accordingly, the length of the assembled contactor is totally surrounded by conductive material, thereby providing shielding element.