{HEAD ~ A transition portion} between {TAIL ~ the elongate portion} and the spherical portion is preferably generally tapered, or frustro conical 
between
{ HEAD ~ A transition portion } between { TAIL ~ the elongate portion } and the spherical portion is preferably generally tapered , or frustro conical
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH