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