The tightening of a screw into a solid material gives a lot of trouble. Enough only slightly to tilt the screwdriver as that breaks down, sometimes cutting slot of the screw. To avoid this trouble will allow the following advice. Sharpen a screwdriver with a semicircular file or emery wheel — as shown in the figure. Work will become easier. A. BARANOV, Prokopievsk, Kemerovo region.
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