Steve,
Here is a thought on how to Swing-Test the Upper Stage . . .
Make an "adjustable sling" . . . One end is passed through the "gap" in the Upper Stage Fins and tied securely around the Body Tube. The other end is tied securely to the Forward End of the Upper Stage in the "notch" formed by the Upper Fins, to keep it from slipping around.
The Sling is adjusted by making a loop and securing it with wraps of Masking Tape, to allow for adjustment, as Nose Weight is added. That will allow the rocket to be properly-oriented for the Swing-Test.
Dave F.
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