Housing 2 includes {TAIL ~ a central key way} 4 disposed along axis 3 for receiving a key 5 in {HEAD ~ the conventional manner} to permit rotation of cylinder 1 
Housing 2 includes { TAIL ~ a central key way } 4 disposed along axis 3 for receiving a key 5 in { HEAD ~ the conventional manner } to permit rotation of cylinder 1
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH