{TAIL ~ the annular shoulder} is centered at {HEAD ~ an axial distance} from the front end of the tip substantially equal to one half said axial distance of the center of the waist 
{ TAIL ~ the annular shoulder } is centered at { HEAD ~ an axial distance } from the front end of the tip substantially equal to one half said axial distance of the center of the waist
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH