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Take a cold chisel and make a straight on divot at 12 o'clock on the top side face of the screw head. Now tilt the head of the chisel to the right and slightly upward so that the chisel is about 45 degrees off perpendicular (this assumes you swing a hammer with your right hand). Now put the cutting edge of the chisel in the divot and strike the head of the chisel. This action should cause the screw to want to rotate counterclockwise. You may have to repeat several times and may even move your divot point say to 9 o'clock and then strike downward with the chisel. The impact from the hammer blow also tends to break up any corrosion on the screw threads facilitating removal of the screw.
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