Wolverine Jayhawk Build, Part 2, Engine Mount Tube & Centering Rings

The brown tube on the left is the rough finished engine mount tube included in the kit. The rear of the tube will be seen on the finished model so it will be replaced. Below it is the thick walled BT-20H from Odd'l Rockets. You can see the difference in the wall thickness between the tubes.

The outside diameter of the new heavy wall tube is wider than a standard BT-20, so the 20/50 ring ends up a bit small.

It's a simple fix -
Peel a bit of the inside ring wrap and peel it out.
On the right is a perfect friction slide fit over the replacement heavy wall BT-20H tube.

The instructions don't show this, but a Kevlar relief slot was filed into the upper ring with the side of a flat diamond file.

A engine hook relief slot was cut into the lower ring.