The pin inside the toilet seat hinge came out (this is NOT the bolt that attaches the seat to the toilet). The pin screws into the lid and then I can slide it through the flange (piece that bolts to the toilet) and then through the seat. However, I can only do it on one side because you have to screw it in first on that side and then slide everything on. There is no way to get everything on, on the otherside and still be able to tighten the pin. If I tighten the pin on the otherside first then I can’t slide it though the hinge and seat. There is no way to screw the pin in once it’s assembled as the end of the pin is just flat. Do I have to just buy a whole new seat?