wherein {HEAD ~ operation} of the pushbutton causes {TAIL ~ the link} and cam to move, the link moving in a direction about perpendicular to the cams direction of motion 
causes
wherein { HEAD ~ operation } of the pushbutton causes { TAIL ~ the link } and cam to move , the link moving in a direction about perpendicular to the cams direction of motion
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH