The Captain's chair base is plywood. The hinging seat booster is attached under the chair to the plywood using four threaded inserts into the plywood. Given the leverage and force of a person sitting on this attachment method, it seems bound to loosen and fail. I'm 6'4" 240# and never felt comfortable with my mass bouncing up the bay on four little machine screws set in marginal plywood. Remove chair, bolt flip-up directly to fiberglass frame, move whole assembly aft 1", seal factory holes, and re-install chair.
