Then you might pick up a tip or two from crossword fan Ivan Greenburg. He has exactly this problem and has devised an innovative contraption to save his puzzle books from such mishaps. [Thanks to crossword center for mentioning this in their newsletter, that's where I heard about it first.]
The device is called 'The Araucaria Counterweight Book Saver', named after its inventor's favourite setter. Read more about it with annotated pictures here on the Chamber's editors' blog, clishmaclaver.
For those who don't keep track of the Guardian crossword, Araucaria is the pseudonym of Reverend John Galbraith Graham MBE, probably the most popular setter on the Guardian crossword team. He is best known for his themed puzzles, clever long anagrams and non-conformance to rigid Ximenean standards.