D-shape plate, bronze, 0.435 in. Thk, center aperture chamfered both sides, 45.0 degrees by 0.062 in., 4.375 in. Od, 2.000 in. Id, 4.015 in. H, two drilled holes 0.312-18 unc 2b, rh, lubricating hole drilled through from outer periphery to center hole, lubricating groove on one side above drilled hole