Bike pedals used to put a metal screw cap to protect the bearings from contamination. Now, instead, use the plastic plugs, which are often lost. Rescue plastic or nylon tubes from medical bubbles. Such substitutes being kept quite steady.
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The scheme is simple electronic guard device published the magazine "Funkamateur" (GDR). Across the doors of the protected object stretched thin wire. Until he is whole, the tension on...
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