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I have some what of the same issue on the passenger chair. Seems to sqweek very annoyingly over the slightest of bumps, but not all of the time. I think that it is coming from the armrest but have yet to closely inspect it to see. I know that you can pull aside the seat cushion ever so slightly enough to get a screwdriver in and possibly tighten some things down, but again I have not yet done this. Time has a way of disappearing on me. Maybe some well placed WD-40? I will try to do something this weekend, let you know.