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