Hi Steve. Fair point, I have difficulty sometimes getting my books to flush with the bed of the scanner, so I usually put a heavy object on the scanner lid to keep it down. Fortunately my scanner has a z-flip lid, so it can accommodate thick books and I don't seem to miss any print. As a rule, I always try and find copies of books with large printing that is clear and easy to read thus increasing accuracy, also I buy paperback editions which are easier to manipulate in to the positions I need for good scanning. All the best, Ibrahim.