A brake hinge configured to connect a main housing and a display housing, one of which is rotatable with respect to the other, and to apply a predetermined torque to the housings, has a torque-generating section shaped like a hollow cylinder. In various aspects of the invention, the recombinant microorganisms may be engineered to overexpress one or more polynucleotides encoding one or more Aft proteins or homologs thereof. The golf balls incorporating the composition are easy to manufacture. Sensors, such as optical or Hall-effect devices, may be provided for determining the position of the elements of the surgical instrument based on the detected rotation of the drive shafts. This probe can also be used with existing endoscopes or laparoscopes so that it will be easily merged into current instruments of different manufacturers, making it easier and cheaper to use this product without the expense of a totally new endoscopy or laparoscope platform. At least one layer of magneto-resistive material is disposed over a portion of the cap.