Using a Screwdriver
Use as long a screwdriver blade as is convenient for the work for maximum torque. Always ensure that the thrust of a screwdriver is at 90° to the screw, otherwise the tip may slip out and score the head of the screw, damaging the work.
When using a slotted screwdriver ensure that the tip should be no wider than the screw or it will score the workpiece. A narrower tip will not apply the correct pressure evenly across the screw head, thus damaging the screw.
When screwing brass screws into hardwood it is advisable first to use the same size of steel screw to form a pilot hole.
To ease binding, rub the thread of a screw with soap or Vaseline TM.
When trying to remove a screw which is stubborn or difficult to move, it sometimes helps to heat the screw with the tip of a soldering iron (taking care to ensure that there is no risk to the material in which the screw is placed). After the screw is allowed to cool down it is sometimes easier to extract.
If the head of a recessed screw is clogged, clean it first with a bradawl. Do not use worn screwdrivers with tips which may be chipped or rounded, in such cases the screwdriver tends to rise and damage the slot of the screw.