The seat that was already put together has a bar that is too short.  When you sit on the seat, the bar on the back of the seat at the bottom breaks apart.  The piece inside the bar should be welded inside and it comes out so the screw won't stay in it.  Therefore only 1 person can sit on the swing.  The more weight, the more it pops out.  I need a longer bar with a piece inside of it so I can screw both sides and it doesn't pop out.