The stopper 50 is positioned closest to the middle section 48 of {HEAD ~ the arm} 14, the stopper plate 52 is adjacent to the stopper 50 and the stopper pin 54 is adjacent to {TAIL ~ the stopper plate} 52 
The stopper 50 is positioned closest to the middle section 48 of { HEAD ~ the arm } 14 , the stopper plate 52 is adjacent to the stopper 50 and the stopper pin 54 is adjacent to { TAIL ~ the stopper plate } 52
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH