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Looking for BT-5 launch engine block rings...

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Fishhead

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Make your own by cutting them from expended 13mm casings.
 

rbeckey

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Fliskits.com has them and many other building components.
 

slim_t

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I've cut my own from spent motors before, but I would recommend the ones from Fliskits.
They're thinner and lighter than a piece cut off a motor, not to mention the hassle involved with cutting up such a small motor.
And hey, at 6 for $1.25, 5 bucks will get you more than you'll need for a while.

Tim
 

sandman

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Very common part!

Estes has 'em

Fliskits has 'em

Totally tubular has 'em

Balsa Machining has 'em

Apogee Components has 'em

Engine hooks...make 'em yourself from old wiper blade metal stips. Use a spent motor and two pairs of pliers.
 

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