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