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