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