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