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Measure from the square drive to the handle. Secure the square drive in the vice. Calculate the appropriate setting for your weight. Hang the weights from the handle of the wrench.
The square drive is the end of the torque wrench you’d attach a socket to. For the sake of simplicity, use whole inches rather than using any fractions. Mark the point you measured to on the handle and record the distance on a piece of paper for you to come back to later.  Set the paper aside in a safe space until you need it. Because 24 inches (61 cm) is a common length for most torque wrenches, it will serve as the measurement for further steps. Orient your bench vice so you can place the square drive of the torque wrench into and have the handle extend out, away from the table or bench. Then insert the square drive into the vice and tighten it until it’s secure.  Be careful not to overtighten the vice and damage the square drive on the torque wrench. Make sure only the square drive itself is caught in the clamp, so the wrench can move under the weight you apply. In order to determine the right setting for the torque wrench, multiply the distance you measured in step 2 by the 20 pounds (9.1 kg) you will be using for your weight. That comes out to 480 inch (1,000 cm) pounds (24 inches (61 cm) times 20 pounds (9.1 kg)) which equates to 40 foot (12.2 m) pounds.  Be sure to use the correct distance and weight figures. If your wrench is a different size or you’re using different weights, your figures will be different. The equation will still be handle distance times weight, then divided by 12. Tie the rope to the weight and make a loop that you can hang from the handle of the torque wrench where you made your mark in step 1. Make sure the length of rope is short enough that the weight won’t touch the ground once you hang it.  Do not securely tie the weight to the wrench. Instead, simply hang it. Be sure nothing is in the way of or supporting the weight as it hangs.