{HEAD ~ A lock} having the duress feature would substitute {TAIL ~ a duress tumbler wheel assembly} for one of the tumbler wheel assemblies  
{ HEAD ~ A lock } having the duress feature would substitute { TAIL ~ a duress tumbler wheel assembly } for one of the tumbler wheel assemblies
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH