Use screwdriver with safety, do the following:1. use screwdriver to fit the mouth of the Groove of the screw head, or the four-headed bolts, such as oral Groove of the screw head must be a four-point star head screw flat Groove of the mouth must be a medium wind.2. the thickness of the mouth of the screwdriver must fit in the Groove of the screw head.3. catch a screwdriver for those who prefer to use the right hand handle hands right butt. Best left hand caught the right hand torque. Best left hand just to support carefully If this is not sufficient, use a wrench making the mouth of the dead.4. use screwdriver to set straight, or perpendicular to the screw head. To unwind, screw, screwdriver, twist counterclockwise and twist clockwise to tighten it tightly.5. torque screwdriver design only. Do not exert too much press.
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