Thew nut does not secure the ball stud. It is used to spread stress on the bottom of the ball stud land. Even better with a washer above the nut. This helps keep the bulkhead brom breaking where the stud is.
When you put the hangers on, especially if you use two screws, you probably don't need the nuts or washers. It would be stronger with them, but I would save weight and not put them on unless I broke a bulkhead.
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