Mine was crooked when I first got it, the screw eyes being higher than the open corners. You can sand it flat on a steel table or piece of glass with some fine wet dry paper. I also found you can actually bend the bowl slightly by placing 2 corners on a round bar and pressing down on the other 2 corners until it's "flatter" across the gasket surface. Mine still leaked after that, but Ive been using the non hardening blue motoseal and been having really good results. Pics show before and after fiddling.