Radio nut." This term is certainly applicable to this receiving set for everything necessary for receiving music and speech by radio has been put into a coconut shell. It was built by
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1964-83 GM Car Radio Shaft Nuts 7/16" Pair | eBay
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Detail: Chevy Parts » Radio Shaft Nut -Thin Hex For 3/8" Shaft (Radio)
Build a Vintage Radio Sweep Alignment Instrument — Part 2 | Nuts & Volts Magazine