{TAIL ~ Alignment hole} 17 is also in the shape of {HEAD ~ a comer} cut out 
{ TAIL ~ Alignment hole } 17 is also in the shape of { HEAD ~ a comer } cut out
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH