I have light adjustable elastic pulling the hoops -- what you call poles -- gently back toward the ends. That's because I set up with a bit more sag, and I want the hoops to hold the netting a bit further away. I've sewn on eyes for the elastic and use prusics.
My NXs are older, and it is possible that the fine tailoring and fit has changed just a bit, so the elastic is not needed, ever, on current production.
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