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.
Recommend to read
A STEP STOOL
The step stool shown in the drawings, can find many uses: as in a city apartment and in the country or in the garage. It is convenient because apart from its main functions due to the...
KEROSENE INSTEAD OF METHANOL
As you know, aeromodelling motor "rainbow-7)" is a typical "Kalinka". But a few additional parts easily turn it into a compression engine with a displacement of 7.0 cm3. Somebody...
