Despite the fact that the clamps clamping the Cup is loosely fitted on the axis and not rotate as you tighten, it can be rotated together with the screw, damaging the surface of the fastened parts. This will help avoid two backing plates with the slots in the ribs strubiny, which can be manufactured from aluminum and even wood.
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THERE IS NO KEY? RESCUE CLAMP!
A wrench is the fact that it is suitable for undoing any size nuts. And if not at hand? Then come to the rescue clamp: because the principle of action at them with a wrench like.
