Why is it that the Rouse-Tech aft closures, even on 75MMmotors, barely (1/16th inch maybe?) contact the motor tube hardware (Aeropack retainers in my case). In other words, it seems to me, the untrained amateur, that the entire thrust of the motor is pushing up on a very small circumference of retainer. The lip of the aft closure could be much wider and I am wondering why it isn't. Is this the reason I have seen some motors shoot right through the motor tube and CATO the rocket?