The cap 44 includes {TAIL ~ a curved top portion} 48 and {HEAD ~ a frustoconical wall portion} 50 which terminates in an opening 52 centered on the axis 41 
The cap 44 includes { TAIL ~ a curved top portion } 48 and { HEAD ~ a frustoconical wall portion } 50 which terminates in an opening 52 centered on the axis 41
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH