10-22-2017, 02:32 PM
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the middle-aged rocketeer
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Join Date: Sep 2006
Location: Urbana, Illinois.....the birthplace of HAL
Posts: 468
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sorry to disappoint you but those are parts for their 20mm D5-x motors they used to import from China. 21 mm is the outside diameter of the motor tube.
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Jeffrey Deem
NAR16741
CIA section 527
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