Beyong the DIR issue (and this is after all the DIR forum) a ball swivel is a very bad idea in my opinion. Search swivel and failure.
Here is an example thread.
Here is an example thread.
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Uncle Pug:There is dynamic and then there is dynamic:
The dynamic o-ring in a 360d swivel is a face seal o-ring and can be extruded through the gap between the halves of the swivel, especially if the screw holding the halves together backs off a bit..