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Twenty-five years ago I was on a job that required bolting several thousand running feet of 2x4 plates to the tops of steel truss joists in preparation for laying subfloor. The work was overhead, and the socket wrenches I used were real knuckle-busters. At the time, I'd have sold my soul for a tool to ease my task, but it never occurred to me to use an impact wrench. Unless you work on engines or change a lot of tires, the pneumatic impact wrenches your local auto mechanic uses aren't always a good fit for a construction job site. But an electric impact wrench may be a good investment for those of us who bolt together massive