The Haystack Needle, here's how to make your own book clock:
"To make a clock, you need two things: the clock movement and the clock hands. There are many movements, but for the simple clocks we make, we buy these. This is a simple, 3-handed movement that runs on a AA battery. For this particular movement, there are a few options. The important one is the column they call "maximum dial thickness". This is the length of that threaded brass neck that sticks through whatever the clock is made from. The options range from 1/8 inch to 3/4 inch. For a typical hardcover book we recommend buying a neck length, or maximum dial thickness, of 3/8 inch.
• Pick your favorite book.
• Decide where on the cover you would like to place the clock hands. They could be centered or off-centered — whatever looks good to your eye.
• You will need to cut a reservoir into the pages of the book to house the motor of the clock so that the cover can shut. To do so, use a sharp exacto blade and cut the book deep enough to hide the thickness of the clock movement, about 1/2 inch. The size of the square hole should be about 2-1/2 inch x 2-1/2 inch."Read the rest of the instructions at The Haystack Needle.