{TAIL ~ Similarly the cam surface} 31 on the lever arm circles about the rod 28 and projects in {HEAD ~ one direction} on one portion 31 of the circle and projects in the opposite direction in the opposite portion 31 of the circle 
{ TAIL ~ Similarly the cam surface } 31 on the lever arm circles about the rod 28 and projects in { HEAD ~ one direction } on one portion 31 of the circle and projects in the opposite direction in the opposite portion 31 of the circle
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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