FIG 3 shows {HEAD ~ the arm} 12 in {TAIL ~ an intermediate position} in which the lengths of the two cords 57 are identical 
in
FIG 3 shows { HEAD ~ the arm } 12 in { TAIL ~ an intermediate position } in which the lengths of the two cords 57 are identical
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH