this item was built poorly.the last thing to do is drill holes to assemble it.they beveled out the holes and tried tofix it by making little washers made from the same composite as the seat.they didn't even assemble it probably cause they weren't sure it would work.it didn't! but i fixed it .it took 2 days & some skill but the customer shouldn't have to go thru that .a second seat i ordered with coins and a dollar bill came assembled and went on easy peasy.