17-4-4-vyvorachivanie-samonarezayushhikh-vintov-s-pryamym-i-krestoobraznym-shlicami.html
17.4.4. A reversing of self-cutting screws with direct and crosswise шлицамиSometimes strongly rusted connections it is impossible to turn on by means of a screw-driver. After several unsuccessful attempts шлиц it is rumpled and to turn out the screw in the usual way it becomes impossible.
1. If it will not be possible to turn out the screw, take a suitable screw-driver and try to turn out it, striking on the handle of a screw-driver a hammer.
2. If the screw has broken, drill its rest.
3. If it is not possible to turn out the screw effort of hands, take advantage of a shock screw-driver.
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