At times the bands need a little adjustment.
Carriage bolts that tighten the bands down onto the grill at times not tight enough, this will cause a little slack in the bands which give the spring assembly a little play. What happens is the springs try to open the dome but they are not strong enough to do it.....they can pull the dome up in the back area. If the spring assembly opens a little it will cause the dome to pull in the back and the only place the dome will actually touch is the front. This is the most common problem the eggs have.
1.) Have someone hold the dome open for you
2.) With a set of locking pliers clamp on the top of the spring and pull the spring up and off the assembly.
3.) Once both springs are off (large egg) carefully close the dome
4.) Loosen the carriage bolt on the dome band and remove the dome
5.) If replacing the gaskets, remove and replace the gasket as per instructions.
6.) Now the important part....when you put the dome back on tighten the carriage bolts until the bend away from the grill. Don't worry you will not break the ceramics.
7.) Have someone open the dome while you put the springs back on.
What you just did is reset the timing on the spring assembly.