Hi all new here but I can't find the answer to this question anywhere. I have a 2005 Northwoods 2023 Party/Fish pontoon. I want to have the L bench reupholstered. Is there a way to remove the seat backs from the plastic bases? I have felt underneath and can only find 3 screws under the entire thing. There must be more to it than that. The seat flips up of course and you just have to remove the hinges from the plastic bases and the seat comes off but I'm just not seeing how the seat backs come off. I've attached a pic of the seat in question. Thanks for any responses!