Glue that short length into a tri-fold mount then recess it 1" inside the body tube. After tying it to the adapter lug you've only got 6" of shock cord left between the Nike and Apache sections.
Add to that, the long upper stage Apache would be swinging and hitting the lower section during descent.
This one will require a LONG shock cord.
I started with a new 5' long shock cord.
To keep the upper section away from the parachute the snap swivel loop was tied about 8" from the adapter lug. In the left side of the picture you can see the tied loop above my thumb and forefinger. The chute snap swivel will attach to that loop knot.
On the right is the distance between the Apache nose cone and top of the Nike booster. Out of the picture top I'm still holding the swivel loop to see how the model will descend.
This long length should prevent and snap back and stop the Apache upper section from banging into the Nike when the model returns under the open parachute.
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