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