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I will have to look at this again, but one issue with a cross pin in the AR240 tower is that there is very little material on the sides of the tower frame/bottom - the part that goes over/around the base block.
My port side pin is constantly rotating 180 degrees during use, but never backed out, thankfully. This is the first time I saw this thread, how traumatic. I remember having the dealer tighten up my tower when I had the boat serviced at 10 hours. The tower would make terrible creaks/ moans when underway at WOT or over just a little chop. Since having them tighten up the tower to hull mounts, I haven't had much noise just a lot of checking the pin each time I stop, or occasionally while underway. Somewhere along the way it became a subconscious check that my mate and I do multiple times per outing. I hope to never hear of another tower collapse on these boats. I'm thankful @swatski and family was not seriously injured.