As a result of this arrangement, {HEAD ~ rotations} of the arm 12 about {TAIL ~ the axis} 9 lengthen or shorten each helical cord 
about
As a result of this arrangement , { HEAD ~ rotations } of the arm 12 about { TAIL ~ the axis } 9 lengthen or shorten each helical cord
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH