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