1. Select a suitable spanner, suitable open end wrench, or box wrenches, such removal will not slide
2. if Rusty a lot, you can beat with a hammer, shock screws.
3. use the rust remover, this artifact can be said to be removing rusted screws and nuts.
4. If the screws are in the steam valve, while it was still hot, remember to use water cooled, otherwise it is easy to remove the bad tooth screw
5. If the welding machine for screw fracture can burn a screw at the top, but burnt welding, the screws are easier to twist out
6. Note, do not use brute force, using skills. You can use the pipe extended, it will be a great effort.

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