I built a 3" diameter PML Bull Puppy that has a 38mm motor mount. Because of the boat tail, I think the idea is just to friction fit for motor retention. But I want to be able to fly it with 29mm motors as well (I want to fly it under 2000' on mid power for the field closest to me). There isn't a ton of stability margin on this rocket, so I don't think moving the motor mount tube farther back would have been an option anyway, but its all glued up and the motor mount is flush with the boat tail end. I have a couple motor mount adapters that are meant to work with screw on retainers, is there any way to make those work with this rocket? Not too concerned about looks, but would rather a solution that can be pulled off for flying on 38mm when a bigger field is available.