As door 12 is opened hook 60 slips out of cocking hole 24 and the second configuration signal device 20 swings downward by gravity into {HEAD ~ the triggered position} to indicate {TAIL ~ mail delivery} 
to indicate
As door 12 is opened hook 60 slips out of cocking hole 24 and the second configuration signal device 20 swings downward by gravity into { HEAD ~ the triggered position } to indicate { TAIL ~ mail delivery }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL