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