{HEAD ~ A slide} that is vertically slidable on the bracket, holds {TAIL ~ a bolt} that has a cam engaged with the cam follower of the bracket, so when the bolt is turned the slide moves up or down 
holds
{ HEAD ~ A slide } that is vertically slidable on the bracket , holds { TAIL ~ a bolt } that has a cam engaged with the cam follower of the bracket , so when the bolt is turned the slide moves up or down
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH