0.2500" first hole diameter 3.2812" overall length one counterboredhole, 0.2810 in. dia. by 0.2810 in. deep, located on backside of flange, 0.1880 in. from periphery to hole center onsame longitudinal plane as hole drilled in body 22a split, external flange one end
1.4800" overall length spiral oil grooves located 180 deg apart, open both ends, dim. 0.0938 in. w by 0.0200 in. min, 0.0250 in. max deep 17a split, plain, no outside flanges