{HEAD ~ The duress tumbler wheel assembly} preferably includes {TAIL ~ a special duress lever} and a special duress gate  
preferably includes
{ HEAD ~ The duress tumbler wheel assembly } preferably includes { TAIL ~ a special duress lever } and a special duress gate
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH