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Always use the longest screwdriver handy for the work. More power can be put on with a long screwdriver than with a short one, normally because the longer screwdriver has a larger diameter handle. Hold the handle securely in the palm of the right hand using the thumb and forefinger grasping the handle near the ferrule. Using the left hand (if you are right-handed) brace the tip and keep it pressing into the slot while renewing the grip on the handle for a new turn.
When no hole is bored for the threaded part of the screw, the wood is often split or the screw is twisted off. If a screw turns too hard, back it out and enlarge the hole. A little soap on the threads of the screw also makes it more comfortable to drive.
There is a regular procedure that is best used to secure two pieces of wood together with screws: (1) find the positions the screw holes. (2) Bore the first hole in the first piece wood slightly bigger than the diameter of the body under the screw head. (3) Bore the second hole slightly smaller than the threaded part of the screw. Bore as deep as half the length of the threaded part. (4) Countersink the first holes to match the diameter of the heads of the screws. (5) Drive the screws tightly in place using the screwdriver.