An inductively coupled fluorescent discharge lamp includes a light transmissive envelope having a re-entrant cavity that has an outer surface inside the envelope, and an excitation coil inside the re-entrant cavity, and a spring clip that is attached to the outer surface of the re-entrant cavity by spring action of the spring clip on the outer surface, where the spring clip includes an amalgam. A data acquisition component acquires service data for a complex system from a data repository. The antenna further includes a first coaxial cable electrically connected to the first radiating unit and the grounding unit, and a second coaxial cable electrically connected to the second radiating unit and the grounding unit. In certain embodiments, the subject devices are characterized by having a shaft and at least two contacting members operatively associated with the shaft where the contacting members are capable of assuming a substantial coaxial alignment when in a low profile configuration and also capable of assuming an open, working configuration. In some embodiments, the propulsion mechanism is a replaceable propulsion mechanism.