The holes in the foot itself have to be significantly elongated to allow it to pivot like that. I see no way for the other foot (the one that is still riveted) to pivot; it is up tight against the leg. The problem side is not up tight; that means that the inner holes are not positioned the same. So tightening the bolt is not the issue; the position of the inner holes is the issue.
Take the bolt that you installed out and let's see the inner part of that foot. Better yet, drill out the rivet on the good one and let's see both to compare; that will answer the question. The Gorilla epoxy may hold, but I would bet that it's only a temporary fix.
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