An apparatus includes a light guide. The case may include a case body, a different material portion attached to the case body and composed of a plateable material that is different from a material composing the case body, and an antenna coil formed on the different material portion via plating and configured to detect a change in magnetic flux occurring at a periphery of the terminal body. A thin insulating layer enables charges to be injected or emitted through it, and a thick insulating layer increases a coupling ratio. The mask is spaced a distance from the diffusing surface. The composition preferably has a pH in the range of from about 2. The system includes a fastener driver, a threaded fastener having a recess for receiving the end of the fastener driver and a forming tool for forming a recess in the head of the fastener.