I think that Yvonne is right that the swivel has little to do with what part of the bag contacts the board. On a fully inflated bag it should not matter if the bag hits on the seam between two panels. That happens hundreds of times in a normal workout and should not really influence the rebound negatively.
And Von Milash is correct that this chainlink swivel can influence the rebound of the bag, but I find it happens much more when punching from all sides around the bag. When punching mostly from the front area of the bag, like most boxers do, I don’t think it will influence the rebound arc too much. However, I like his modification. I have modified swivels several times, but have never seen the one he made.
Chris Nagel, here is a video of that particular "Boxing Gear" ballhook swivel “Huevo de Diablo." . That’s a good one..
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