在实际生产中,当遇工具不全而又需卸下螺纹受损的螺钉或折断的螺栓时,可用废丝锥改制成螺丝刀(见图示)。选大小适当的废丝锥,在其四个侧面上磨成5°～7°的斜面,使其头部的方形略小于螺栓头的内六角槽或待起卸螺钉上所钻的孔,然后用丝锥扳手将其拧出。实践证明,这一改制的简易起卸螺丝工具简单、方便、实用。 In actual production, in case of incomplete tools and need to remove the screw damaged screw or broken bolt, the tap can be transformed into a screwdriver (see picture). Select the appropriate size of the tap, grinding on its four sides 5 ° ~ 7 ° of the bevel, so that the head of the square slightly smaller than the head of the hexagonal slot or to be unloaded screw holes drilled, and then with Tap the wrench to unscrew it. Practice has proved that this simple conversion screwdriver tool is simple, convenient and practical.