11-26-2014, 01:45 PM
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Freeform rocketry advocate.
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Join Date: Jan 2008
Location: Claremont, CA "The intellectual capitol of the world."-WSJ
Posts: 3,780
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I believe the ID of a BT-70 is 2.175" so the shoulder should be 2.17 not 2.18. We specify about 2.165 on ours.
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