Adjusting the strap

Most clasps have a series of small holes drilled in them, and the end of the strap is held in by a small, spring-loaded bar whose ends are seated in one set of holes. Take the end of a small paperclip, or a large needle, and use it to depress the spring-loaded pin. You can then carefully slide it to another set of holes to make the band smaller. Don't let the ends of the pin slide all the way out of the clasp, or it might shoot off into space.