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