A headrest frame fabricated from a plastic material and having a core material with a cross-sectional shape that provides rigidity equal to that of a headrest frame fabricated from iron. In various embodiments, a chain description data set is generated to specify an order in a configuration chain of configurable devices in the system and identify configuration data sets associated with the configurable devices. For example, the ion implanter may comprise an ion source configured to provide an ion beam. The mounting clamp has a cavity configured to receive the guide arm such that the guide arm extends past the roller cover.