Anytime you install a replaceable Kevlar tube, cut it back away from the top of the engine mount tube.
It doesn't have to be flush with the top of the centering ring.
The engine mount is glued into the BT-80 "Exhaust Tube".
Recess the lower ring 1 3/4" up from the end of the tube.
My square ended steel ruler works well as a depth guide.
Looking ahead,
Check out the shroud line locations on the oblong parachute.
There are six "corners" but eight shroud line locations.
All the shroud lines are attached at an angle.
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