{HEAD ~ A link} pivoted to {TAIL ~ the yoke} has one end portion contacted by the shaft and the other end is in contact with one end of a spring biased pin  
pivoted to
{ HEAD ~ A link } pivoted to { TAIL ~ the yoke } has one end portion contacted by the shaft and the other end is in contact with one end of a spring biased pin
HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH OTH