{HEAD ~ Positioning arm} 60 is attached at {TAIL ~ one end} to an adjustable pivot 62 
is attached at
{ HEAD ~ Positioning arm } 60 is attached at { TAIL ~ one end } to an adjustable pivot 62
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH