A fan control system and method is configured to adjust the speed of a fan. The overall image shows a trajectory image that represents the trajectory of the drill bushing and a jaw image that represents the jaw. The jewelry piece wearer may select the location of the placement of the adjustable retainer anywhere along the length of the strand. In some embodiments, two fluent materials may be mixed within the seed boot and dispensed together. Location and rotational attitude information may be used to construct a three-dimensional representation of the medical device within the localization field.