These tray locking members 50 wedge against {TAIL ~ the flat side} 51 of the extrusion 37 to secure the tray 15 in {HEAD ~ position} and prevent it from sliding from side to side 
These tray locking members 50 wedge against { TAIL ~ the flat side } 51 of the extrusion 37 to secure the tray 15 in { HEAD ~ position } and prevent it from sliding from side to side
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH