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