Rocketarium Aluminum Motor Retainer 18mm ROC-AMR-18
These 18mm motor retainers work with BT-20 body tubes. Thicker paper tubes can be sanded to achieve a fit.
Full set weight : 0.13oz/3.7g. For use with all 18mm motors, including Estes/Quest 18mm A-C motors, and Aerotech single use and RMS 18mm motors.
No tools required to operated. Motors without thrust ring are friction-fit.
Please see the installation instructions for details.