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Aero Pack minimum diameter retainers

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PedroTheRocketNerd

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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 threaded hole. I could tap the Loki bulkhead out to 5/16-18, but would that count as "modifying the motor" which is not allowed by NAR/TRA rules? Could I modify the retainer in some way? Or should I use an entirely different retention method altogether? Any and all ideas appreciated.
 

gfunk

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Check out McMaster Carr # 98434A110. Female Hex Thread Adapter 18-8 Stainless Steel, 1/4"-20 to 5/16"-18 Thread Size
 
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