The sustainer engine mount got a Kevlar shock cord tied on beneath the upper ring.
The long end was fed through the engine hook slot.
The loop was pressed into the the glue fillet going around the centering ring.
Both the booster and sustainer engine mounts end up even with the low ends of the boy tubes.
I used the flat side of the sanding block to press the two tubes flush.
Apply glue inside the upper end of the booster tube.
The coupler is pushed in the front end of the booster until it butts up against the upper centering ring.
It actually sticks out farther the instructions show.
After the coupler is glued in, immediately slide the upper sustainer tube in to make sure the tubes are in line.
Turn the upper tube. Remove the upper tube so it doesn't get glued in.
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