The engine bells are glued in place, centered behind the SRBs.
Drilling the centering ring for the rear vent holes took a little bit of work.
I first used a sharp awl to mark the center and to make something for the drill to center itself in.
To start the hole, I used a smaller drill than the recommended 1/8" drill.
The 1/8" drill was used for the final hole size.
I covered the front of the body tube with the palm of my hand and blew into the engine mount tube. My breath did come back out through the engine bells!
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