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    Aero Pack minimum diameter retainers

    I am planning to build a minimum diameter 38mm rocket, using the Aero Pack minimum diameter motor retainers. I am planning to fly Loki Research motors in it. However, I have ran into a problem: the Aero Pack retainers have a 5/16-18 threaded bolt, but Loki plugged bulkheads have a 1/4-20...