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Even metal will not last forever. That verge bolts can eventually rounding, which makes impossible their subsequent loosening. Especially often this happens with rusted or soured hardware. In fact, it does not matter, because there is a way that will allow virtually any unscrew a bolt, regardless of its deplorable condition.
To twist the bolt problem, need to get hold of some tools. On the hand must be nutrunner, arc welder, extractor, impact screwdriver, wrench liquid (or WD-40), a drill with drill bits and a set of keys (richer, the better). With all of the above can be unscrewed whatever your heart pleases. Now let's talk directly about the process of working with bolts with ripped edges.
Before you grab for the "hardcore" methods, you should try something simple and common. If one key is rotated, you can try to pick up the other hard components. Instead of the usual key there is reason to try to use the union. Quite often, it helps to solve the problem with a bolt. If the bolt at the same rusty, you should be sure to handle it WD-40 before you even try to do something with it to make other tools.
NoteIf the liquid does not help key (rusty bolt so), it can be heated. However, you will need a gas burner for this.
Help many extractors. / Photo: youtube.com.
If the "simple" methods do not give proper result, you should use "special". The first step is to seek help from a special head-extractors. Cone shape and helicity of the tool allows to pick up the problematic edges. The only "but" it is that then the bolt would have to knock out the tool. Similarly, the decision could be licked bolts special keys with curly grooves. Their operating principle is the same as that of the extractors.
If this does not work, you can try to "take" the bolt by means of a sliding switch. Such a tool there is no need to clamp bolt tightly. In addition, it provides a convenient lever for loosening even the "bad" bolts. Rind this alternative method is to use impact method - untwisting problem bolt hammer and chisel. First, you must make a groove using a chisel. The tool rests on this same groove, and unscrewed the bolt strikes.
Note: If you have a bolt head was torn completely, unscrew it by traditional methods does not work, it is necessary to resort to the use of special extractors and drills.
Continuing the theme will talk abouthow to translate the screwdriver to the new lithium-ion batteries with annoying nickel-cadmium without much difficulty.
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A source: https://novate.ru/blogs/170319/49814/