There are a huge variety of turntables available; some are platterless, some are made for high-altitudes, and some are made out of recycled steel bridges. According to a short Science Channel documentary "Made By Destruction" there are over 600,000 bridges in the United States, and when those bridges become structurally unstable, they can be reforged into vinyl players.
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The video shows how metalworkers in Virginia melt down the bridge parts and contruct a base by pouring the molten metal into moulds. Once cooled, it is then ready for milling - the process of cutting holes into the base to make space for the turntable's wiring and components.