Howdy folks! First time posting here. I recently bought a 2015 240 Sundeck at the beginning of March. We were told by the previous owner that the Passenger Seat wasnt secured prior to purchase. Upon examining the situation it appears that the entire cushion has gone unsecured from the mount. Does anyone have recommendations on the size screw required to resecure it? The board inside the seat is about 1/2" thick. Pics included Thanks for any help.