{HEAD ~ The circular cam surface} 30 of the flange 27 of U plate 24 circles about screw 28 and extends or projects in one direction on {TAIL ~ one portion} 30 of the circle and projects in the opposite direction in the opposing portion 30 of the circle 
{ HEAD ~ The circular cam surface } 30 of the flange 27 of U plate 24 circles about screw 28 and extends or projects in one direction on { TAIL ~ one portion } 30 of the circle and projects in the opposite direction in the opposing portion 30 of the circle
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH