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