The other of {TAIL ~ the pair} of apertures to cooperate with the output end of {HEAD ~ the rotary shaft} to form a second connection 
The other of { TAIL ~ the pair } of apertures to cooperate with the output end of { HEAD ~ the rotary shaft } to form a second connection
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH