{HEAD ~ The head} is shaped to define a channel for receiving an exposed margin or {TAIL ~ flange} of a hinge mount to rigidly engage the hinge 
is shaped to define
{ HEAD ~ The head } is shaped to define a channel for receiving an exposed margin or { TAIL ~ flange } of a hinge mount to rigidly engage the hinge
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH