Each spring lever is selectably biased against a back side of {HEAD ~ the strike plate} in {TAIL ~ a first or second detent} 
in
Each spring lever is selectably biased against a back side of { HEAD ~ the strike plate } in { TAIL ~ a first or second detent }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL