{HEAD ~ A slide} that can slide vertically on {TAIL ~ a bracket} fixed to the dish, carries a bolt that can be turned to move the slide up and down 
{ HEAD ~ A slide } that can slide vertically on { TAIL ~ a bracket } fixed to the dish , carries a bolt that can be turned to move the slide up and down
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH