An elongated means under tension is provided within the arms and about the joint members for maintaining the position of {HEAD ~ the head end} in given {TAIL ~ angular position} 
An elongated means under tension is provided within the arms and about the joint members for maintaining the position of { HEAD ~ the head end } in given { TAIL ~ angular position }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL