With the nozzle and base disk glued even with the bottom of the motor mount tube, the lower centering ring follows. The lower ring is the one without a hole for the Kevlar line.
The Kevlar line is tied around the motor mount tube with the loose end through the hole in the upper ring.
On the leg alignment card stock is a depth gauge for the upper centering ring.
Set it over the top, slide up the ring and glue on the tube. Turn the depth gauge to be sure the ring is even from all sides.
Here's the finished engine mount ready to be glued into the main air frame tube.
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