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