If the head of the screw to give with the help of nalilsya the form shown in the figure, then any attacker will not be able to turn. On such hardware it is recommended to set sensible things sailing and motor boats, hook locks.
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Is it possible to catch a fish, caught in an extreme situation and not having anything on hand for this? But the button that you have? And to dissolve any knitted thing, to get thread...
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