The screw slide means that there is no way to remove the screw through the screwdriver, mainly because the screw teeth are worn and cannot be engaged with the screwdriver. The reason why the screw slips are that the screw teeth may be worn too much due to too much force during screw tightening. Another reason may be that the quality of the screw is too poor. If you want to remove the screw of the sliding wire, you can use pointed nose pliers to clamp the screw, and then turn the screw of the sliding wire in the opposite direction with skillful force. After about three or four turns, the screw will become loose.