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