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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A good assistant hostesses will be crashcatcher for cans with screw locking. To make it simple: two bars must be screwed pieces of steel channel, and one of them should be wearing rubber...
