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>Torque sticks, also referred to as a “torque limiting extension bar,” are an extension for your impact wrench, and they basically act like a shock absorber. They work on a torsion theory, which is just a fancy way of saying they flex at a certain rate, then stop applying torque when they reach a specified flex point.
As far as I can tell they are designed to twist along their long axis. ~~This can be useful when you want to apply a lot of torque to a nut in order to bust it loose, but you dont want to strip or damage the nut.~~ The torque stick will twist before the nut deforms but still transfer the energy to the nut in order to ~~bust it loose~~
Please correct me if I have misunderstood this
Edit: as stated below they aren’t used to loosen anything. They allow you to tighten nuts to a specific level
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