Quest Striker AGM Build, Part 2, Engine Mount Assembly and Upgrades

To use the Odd'l BT-20H heavy wall tubing with the 3" long Odd'l Rockets XLEH (EXtended Length Engine Hook) - available soon!
Cut the BT-20H engine mount tube to 3" long.
Cut a notch for the forward bend of the (longer) engine hook, 1/4" from the forward end.

Notice the position of the engine block - It will end up glued underneath the top bend of the hook. See the fourth picture in this post. This prevents wear and tearing of the engine mount tube.

Here's a dry test fit of the kit supplied centering rings. The fit was very close, it took a few easy passes of 220 grit around the center hole for a friction fit on the slightly wider diameter BT-20H tube.
I did the test fit to mark the rings for a notch cut at the engine hook locations.

Looking ahead - 
GOTCHA: Here's the first problem in the instructions:
If you do a tape wrap around the engine hook, you won't be able to slide the tube (with the tape wrap) into the tail cone after the centering rings are glued on the ends.

So - First, glue the smaller low ring in place on the small end of the tail cone adapter. The engine mount tube is slid in and through the lower centering ring. Then glue the top ring over the BT-20H and down onto the tail cone.

The engine block is slid in from the bottom, dry no glue yet.
Use an engine casing to push it up and against the upper bend of the engine hook.
Leave the engine casing in place for now. From the top, apply a glue fillet locking the engine block in place. Remove the engine casing.