I spent some quality time in our Gemini this weekend and got up close with the underside of the table.
In our case, the wobble seems to come from some slop and loose screws holding the table itself to the metal support bracket, way back almost at the wall of the dinette.
I tightened what I could and 90% of the wobble is gone and the table feels much more secure. We'll see how long it lasts.
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