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I think the reason shops don't use regular rachet extensions is because most of the torque (99%+?) is transferred in standard extensions. These sticks are made to flex and absorb energy. I don't know what material these sticks are made of, but I believe they don't have the same material composition as a standard extension (nor the same pricing either). I don't believe that a 6 inch long 1/2 inch rachet extension would flex that much. There would be some though, however small, but not enough to affect torque specs.
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