a rolling cutter shell mounted for rotation between said arms, said rolling cutter shell having first and second end portions and {HEAD ~ a tapered annular external surface} between said first and second end portions, said tapered annular external surface having {TAIL ~ a slope} at an angle within the range of substantially 2° to substantially 40° 
a rolling cutter shell mounted for rotation between said arms , said rolling cutter shell having first and second end portions and { HEAD ~ a tapered annular external surface } between said first and second end portions , said tapered annular external surface having { TAIL ~ a slope } at an angle within the range of substantially 2 ° to substantially 40 °
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH