Madcow Bolt-on Motor Retainer 29mm

Product Description 29mm Motor RetainerBoth the 24mm and 29mm motor retainers have the same mounting hole arrangement which allows both retainers to be used interchangeably on the same rocket - i.e. use the 29mm retainer when using 29mm motors, use a 24/29 motor adapter and 24mm retainer when using 24mm motors.Threaded inserts allow the retainer to be added after the 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 1.9" ID to clear the retainer.