The Vapor looks like a great kit for the BP 29 motors, and at $15, is a fantastic deal. Just a little 29mm tubing, and it's a Low cost Star Orbiter. I'd skip the screw-on retainer, since it's unlikely to get many flights.

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Paul
If we weren't all crazy, we would go insane - Jimmy Buffett
NAR #87246 www.wooshrocketry.org