I have a friend that called me and they recently replaced their liner. We were too busy to help and walked them through the process. They did a great job but One of their main drain gaskets moved and is about 18" away from the drain. I went to view it and have never fixed one like this. My question is this: Can the drain cover be taken apart with water in the pool, reach or fish over to the gasket and pull it back to the proper spot without messing up the pool? Part of me feels the pressure in the pool will not let the liner move and the holes will line back up. Another part of me feels like when you raise the liner to get the gasket water will get under the liner and you may not get it back out to make everything work. Any suggestions?