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