My son, Tim, asked me, “Hey, Dad, can you make something like I saw at Comdex?" He had just come home from a computer-oriented seminar and wanted to find out if we could make the heads on a defective hard drive rattle back and forth for Show and Tell — silly question. His older sister, Joy, had asked about a louder metronome. His younger sister, Robbi, had asked about a violin-tuner. Joy now has a loud metronome and Robbi has a tuner (Nuts & Volts, November 1999). ..
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