The last thing you want to do it spit the motor out at ejection... that way you lose the rocket AND the motor casing. Rowes Retainers are an essential flight safety ingredient... and they look very cool, too.
All Standard Retainers are made from Aerospace Spec Aluminium and are Anodized to MIL-SPEC Type 2 Class 2 (Red).
Each Retainer fits (nests) inside the next size up. So a 29mm will fit into a 38mm Retainer and a 38mm will fit into a 54mm Retainer, etc. this is especially useful if you are flying a rocket with a motor reducer. The photo shows the 98mm retainer and thrust ring assembly. The thrust ring costs an additional £13.99.
Rowes Retainers make both standard and coned retainers. Please note : Cones will not nest in each other, but Standard Retainers will nest in Coned Retainers.