I have a small Bomar hatch (10"X10")with cracked lens, I have removed old lens and have a new one to seal back in. Problem is that the lens appears to have to float free in sealing compound, if it seats down on flange the gasket pushes onto its then not possible to install the gasket. Anyone done this trick ? If gasket installed and then lens rests on it the gasket wil be sealed with the lens and original was not like this as I can reuse the gasket.