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