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