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