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Ask your local airplane repair shop. They are required to periodically verify the accuracy of their wrenches, and there is usually somebody nearby that does this for them. This is what I did with my three Harbor Freight torque wrenches. If they had been out of calibration, the guy who tested them would not be the guy who adjusts them. This guy just checks them. They were within the aviation spec (3%?).
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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