The active door lock includes a dead bolt and a lever for {TAIL ~ extensible locking engagement} with a strike plate on {HEAD ~ the inactive door} 
The active door lock includes a dead bolt and a lever for { TAIL ~ extensible locking engagement } with a strike plate on { HEAD ~ the inactive door }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD