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What I did is slip those two glued together corrugated cardboard rings into the aft end and epoxied them to the aft centering ring. Depend on thickness you could use three instead of two, I should have. The aft most ring is the one the lip of the tail cone gets epoxied to. The first picture is a dry fit...
In the second picture 30 minute hobby grade epoxy is applied to lip of the tail cone and the lip of the aft most sandwiched cardboard centering ring and allowed to dry. I used a stiff piece of tubing and weights to keep it round and centered.