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