How can I flatten out a paper back cover?

I recently got a manga signed from my favorite voice actor and I want to keep the book in the best shape possible. There are no creases or bent book spine, but I just want to try to flatten the front cover so that it closes a little more. You know, when the cover looks like it is partially open and it drives you... show more I recently got a manga signed from my favorite voice actor and I want to keep the book in the best shape possible. There are no creases or bent book spine, but I just want to try to flatten the front cover so that it closes a little more. You know, when the cover looks like it is partially open and it drives you crazy? Other than that, everything's cool.
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