Problem
If you notice that the spine is warp and the cover is not closing properly or hard to close. This is usually due to the screws securing the spine and the acrylic tank are too tight.
Solution
Loosen the screws holding the spine and the tank as much as possible. This will straighten out the spine, thus, making it easier to close the cover. The screws will not compromise the structural integrity even when they are loose.
Note
When closing the cover be sure that there are no cables or parts getting in the way.
The video below shows how to properly close the spine cover.
There may be a small gap between the cover and the spine. The parts will fit together better with time.