{HEAD ~ The shaped bar} is removed from {TAIL ~ the chamber bottom end}, upon opening the bottom wall, by shifting it to an opened position laterally offset from the open bottom end of the chamber 
is removed from
{ HEAD ~ The shaped bar } is removed from { TAIL ~ the chamber bottom end } , upon opening the bottom wall , by shifting it to an opened position laterally offset from the open bottom end of the chamber
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL 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