Jim,
So let me ask a different question then. Note, I'm sure this is buried in the many detailed posts you've been so kind to share, but maybe we can focus in on it here.
In the case where you're holding on to the sustainer, in the IC, with the motor hanging out and no thrust ring (which I've read in a couple threads where you talk about this), how do you hold on to the motor in the sustainer? I know there are MD solutions like an aeropak MD for example. What if I want everything to come out?
Do you say, Don't do it, Paul. Come up with another way! Design around it.... lol.....
OR
Do you have some ways you've done this before that would work? Just friction fit with shock cord attached to forward closure, thus "captured". Always design a "glued in" thrust ring of some sort on top of the motor?
Think something like this
https://www.badassrocketry.com/product-page/badass-md-retainer
As always, thank you!
Cheers,
Paul