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Cylinder(r = 8, h = z height, e.g. Height of that system; it is safe to put reinforcing walls; i.e. The thickness of the round part of the hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) .

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