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