Each flap preferably is {HEAD ~ about 21/2 inches} in {TAIL ~ length} and 5/8 inch wide 
Each flap preferably is { HEAD ~ about 21/2 inches } in { TAIL ~ length } and 5/8 inch wide
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH