The free-run unit (5) rotates over the end of a shaft located at a fixed distance from the nut to be loosened. It has a rotary axis parallel with the nut socket (2). The second lever (4) is connected to the first (1) and is pivotable relatively to it around an axis (7a) which is parallel to that around which the free-run unit (5) rotates, located at a greater distance from the nut socket (5) than the f.ee-run unit (4).
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