The apparatus 30, wherein said diameter reduces in size in {HEAD ~ a direction} from {TAIL ~ said leading end} to said trailing end 
The apparatus 30 , wherein said diameter reduces in size in { HEAD ~ a direction } from { TAIL ~ said leading end } to said trailing end
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH