Myth that socket extensions change torque wrench readings

Having spent 30 years in the missile building business, I can assure you we didn't adjust our torque values for any twisting action in an extension.

Of more concern would be whether your torque wrench is properly calibrated or not. In our business, we would recalibrate torque wrenches every six months. On average 5% of them were out of the specified tolerance at this interval. How many home mechanics take their torque wrench out of the box, and never calibrate it for the life of the wrench?