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