One of my boats is a rec kayak & the seat is missing 2 of the screws that hold it on. They are a 2 piece fastening system. One female insert into the seat support (plastic), then a plastic head male screw from the seat itself into the insert. Anyone have a better system for fastening a seat to the seat support ?? The system I have comes loose, or the screws break from movement. Getting tired of flopping around in my seat when I paddle.