Many logbooks are very small, especially those for hitchhikers, microboxes, cooties, and other small letterboxes, and you might find that a stamp is too large to fit completely into the logbook. It might be your signature stamp, or it might be the stamp from a letterbox you need to stamp into a hitchhiker's logbook, or a variety of possibilities, but the end result is the same: The stamp will not fit into the logbook. Don't worry, just stamp a portion of it. Choose the most significant part of the stamp to add to the logbook.