Finegan pin
 n.— «Finegan pin…[struck] a vague expression to cover the fact that something in the car in [ sic] wrong but not yet exactly known, a whosis, etc. Its [ sic] akin to the slang expression, A paper-stretcher, or left-handed pencil.[end struck text] Non-existent auto part which mechanic blames for trouble he cannot locate.» —“Gas Station Slang” by A.T. Rosen in Brooklyn, N.Y. Lexicon of Trade Jargon , 1938-39. (source: Double-Tongued Dictionary)

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