You may have already done or considered these suggestions, so ignore if you have. You might visually check the dome alignment while you are assessing / working on the issue. Several threads describe this process in the Owner's Section, Use and Maintenance. As for the gasket, I have had success using the paper test method described by @Paswesley from a conversation with Dennis. Generally, it is the following: Dennis’ idea involves using strips of paper, perhaps 20 pound (0.004”) c