2. Use fire. After fully burning the screws and nuts with gas welding oxidation flame for a period of time, drop a few drops of oil on the red-hot screws to cool the screws quickly, which can also increase the gap between the screws and nuts. It's very easy to twist it again at this time.

3. If the screw is slippery, you can pad a small rubber block on the slippery screw to increase the friction of the screw. At this time, you can easily turn the sliding screw, so that you can easily remove the screw.