I use 3 small sheet metal screws, as they have a fairly flat head - did this for my 2.6" L1 bird, which can fly on F-H motors. I use the payload section for an RF tracker. For LPR, just 2 tiny nylon screws.

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