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This is a total guess....but is the base of the tower tight? We've had posts from members saying their tower base screws were not tight.
the big screw that keeps the tower upright is tight. I wonder if there is a screw or bolt underneath that holds it in place, I guess will have ot lower it to check.
Yup....there are bolts underneath (royal pain to get to) that can be tightened to hold the base secure. When I got in there to add my bilge outlet, I had to have my wife help because I knew if I lowered myself into that under seat compartment on my back.....I'd be like a turtle stuck with no way to get out!