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