Screwdriver Torque Tips
Next time you're using a manual screwdriver to loosen a stubborn screw, try one of these tricks, which can help increase the amount of torque applied to the screwhead.
If the screwdriver has a hexagonal-shaped shaft, slip on a ratcheting box wrench, as shown at right. Position the wrench about an inch or so from the screw head. Then, as you twist the screwdriver handle with one hand, use your other hand to pull on the wrench. You'll be surprised how much more torque you can produce to bust loose virtually any screw.
And if the screwdriver has a square shaft, use an adjustable wrench, as shown below.