3829mm Motor Retainer
Both the 3829mm and 38mm motor retainers have the same mounting hole arrangement which allows both retainers to be used interchangeably on the same rocket - i.e. use the 38mm retainer when using 38mm motors, use a 29/38 motor adapter and 3829mm retainer when using 29mm motors.
Threaded inserts allow retainer to be added after model is built.
Note: This retainer requires a rocket with an aft centering ring to mount the threaded inserts. The body tube should be at least 2.5" ID to clear the retainer.