Jewelers live and die by the little things. You know those little screws that hold your eyeglasses together? Well, jewelers work with screws and other parts that make those look like lug nuts. I watched my father work on watches for many years with this very same jewler's loop. It's banged up and dented from many years of service, but the lens still renders the intricate innards of a Waltham railroad watch in striking detail.