How to unscrew the screw, if it has disrupted cross?
Not a rare case when a strong tightening of the screw, it grinds cross and turn it back is almost impossible. However, there is a suitable life hacking, which in most cases can improve the situation.
For life hacking, we need ordinary rubber band, which can be purchased at any store specializing in stationery. Typically, such gum sold in packs of 300 - 500 pieces, and they are quite cheap.
Not all the gum will do, you need to choose those with a minimum width of 0.5 cm or if there is something you can and more. Now take a rubber band and put it on top of the cross stripped screws. Next, take a screwdriver and gently begin to twist it.
You can of course use a regular screwdriver, but the effort you spend is not enough, besides the usual screwdriver to do this is not very convenient.
If you wriggle screwdriver, then it should be done on a very small turnover, or gum can simply break. Usually, a few seconds is enough for successful unscrewing screws.