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