18mm casings can be sanded to take a 13mm motor great for the shortie rockets. 24mm to fit 18mm
Filled with lead and clay to the right weight for dummy motors for test swings and balancing,
Cut in half carefully then filled with different colour clay to show the inner workings of a motor.
plug the nozzle end and paint bright colour and its a great rod cap.
mandrels for gluing on fins
node cone shoulders
two 18mm caseing make a great make shift flashlight.
shredded and pealed down they work great as fire starters in survival kits
Cleaned out they each hold one battery great to keep the batteries apart when traveling.