System Handpiece: The 2C is one of the most demanding of the tracking system components. Its design brief called for an extremely challenging set of requirements: ultra high precision and stability. A constantly clear line of sight to the tracking camera and no tolerance for surgeon hand movement limitation or collision with the patient's body and other system accesories. The 2C also had to be easily removed and accurately returned to the drill for sterilization, and have the ability to flip over for upper and lower jaw procedures. Led positions needed to be accurate to the 0.005 th of a millimeter requiring high performance glass reinforced polymers, and extra coordination between the design and plastics engineering teams.