Rust and oxides can turn most of the car's joints into a single, inseparable thing in the blink of an eye. As a result, there are huge difficulties when trying to disassemble such a joint in order to replace or repair any part. In such a situation, even a "liquid key" will not help, since the lubricant simply cannot penetrate between the problematic elements. However, you can gracefully get out of the situation without going to a car service and a variety of ritual "dances with a tambourine."
The history of mechanics is inseparable from the history of the fight against rust and oxidation. This phenomenon is quite natural and at the same time widespread. Even the most modern, high-tech and protected components and joints sooner or later begin to rust. As a result, the day is not far off when the master simply cannot open something important with his favorite screwdriver. Worst of all when it comes to mechanisms operating in an aggressive environment. A striking example of this situation is the operation of the car in the winter.
So, what to do if some articulation in the Swallow is stuck and doesn't want to give in? In fact, you can not go to a car service, but do everything yourself. And we are not talking about any "old-fashioned" methods, but about the use of a very specific and professional impact-rotary screwdriver, a tool with a wide range of applications. To work with such a tool (in particular, to unscrew stuck elements), you will also need a hammer.
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The bottom line is that the mentioned tool allows you to unscrew the stuck bolts not due to the effort of the hands, but due to the energy of the hammer blow. As a result - an increase in torque and force tenfold. All you need to do is make the fasteners rotate at least a millimeter. After that (most likely) it will be possible to start up a completely ordinary, "traditional" screwdriver.
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How does an impact screwdriver work? First of all, the problem screw should be wetted with brake fluid or a "liquid wrench". Better yet, make a compress for 10-15 minutes. After that, a screwdriver is placed on the hardware exactly in the slot and one not very strong, but accurate hammer blow is applied to the base of the tool. Then two or three more attempts are made. In most cases, this is sufficient.
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A source: https://novate.ru/blogs/190220/53478/