UP Trango XC Owner Manual And Service Booklet page 37

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There is however a small trick you can use
to be good to your new wing, see the
following illustrations:
Choose your own method of folding the
wing into a narrow sausage.
Then fold the sausage from the trailing
edge forward...
... all the way to the leading edge.
Do NOT fold the leading edge under,
as shown here above.
The leading edge should be on the
outside of the bundle when you are
finished – secure the bundle with the
compression strap.
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