1 Shock: For rusted screws, do not use a wrench to tighten them hard, in order to prevent the six-sided edges and corners of the screw from slipping, breaking the screw or screwing the wrench. At this time, the handle of the wrench can be gently shaken with a hammer, and the rusted screws can be shaken and unscrewed.

2 Knock: Use the edge of a square top hammer to knock the rusted stainless steel nut, it is easy to loosen the nut. For example, the nuts of the fixing bolts at the two ends of the pedals of a bicycle can be tapped on the nuts according to the thickness and metal structure of the pedals. The nut at the cast iron part can be slightly stronger, and the plastic part should be tapped lightly. If it still doesn't work, tap the nut in a circular motion with a hammer to remove the nut easily.

3 Burning: Some screws are very seriously eroded, and the above method still does not work, you can use "fire attack". Use a gas welding oxidizing flame to fully grill the screws and nuts, and then drip a little oil on the red-hot screws. The purpose of heating the screw is to heat the screw to expand. The purpose of dripping oil is to make the screw shrink rapidly when it is cold, increase the gap between the screw rod and the stainless steel nut, and the nut can be unscrewed after the oil flows in. However, use this method with caution if there are plastic devices nearby.

4 Punching: The top of the stainless steel screw of some devices is corroded and out of shape, and it cannot be removed with a wrench or wire cutter. Both the impact method can be used. **Use a hammer and a flathead screwdriver to strike a v-groove vertically at the top of the screw. Then, adjust the angle of the punch and strike in the direction the screw is unscrewed. After loosening, the screw can be unscrewed with wire cutters. This method can also be used to unscrew the screw with wire cutters when the "one" or "cross" screw is sliding.

5 Soldering: When disassembling the device, it is not uncommon for the screws to be broken. For screws with broken tops, electric drills are generally not used, because the wire holes will be drilled if you are not careful. A better way is to weld a long piece of iron to the broken wire. The section of the iron block is determined by the diameter of the stainless steel screw.