04-10-2022, 09:52 AM
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Master Blaster
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Join Date: Aug 2011
Location: South Florida
Posts: 576
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It is very easy if you have any Estes BT 50 to BT 20 centering rings, just strip some of the outside of the BT 50 ring off until it fits in the 21mm FSI tube then build a 18mm engine mount and install. No need for special parts..
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Neal Miller
Master Blaster NAR# 58296
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