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