One of my cornelius kegs has a leak. I have traced the leak to the large latch in the top. The in and out valves are fine. The gasket is new, but I have noticed that the lid does not seem to seat perfectkt in the opening. Even when I put the top on and hit it with a bunch of pressure I hear it seat, but it still leaks....slowly, but it leaks. The opening in the keg is NOT perfect, it's a little bit tweaked, but it seems like it should seal???? Any tips or tricks, or is the keg shot?