I just had to repair a rust issue. In the process the liner had to be unhooked at the top and the skimmer taken off. Now, I can not get the liner back up high enough to completely go over the Haywood butterfly gasket at the bottom. Is there an oversized gasket? I only need 1/4 inch! In other words the liner will not go high enough to completely cover the bottom of the butterfly gasket. I have heated and pulled. Maybe, someone has encountered this before?