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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Not only plastic, but also wood rulers, especially the long, at carrying out with their help lines are often displaced under the pressure of the pencil or ruling pen. This does not...