The second member is removable from {TAIL ~ the channels} by pulling the second member away from the channels to disengage the flanges from {HEAD ~ the channels} 
The second member is removable from { TAIL ~ the channels } by pulling the second member away from the channels to disengage the flanges from { HEAD ~ the channels }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD