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metallic metal metalline tin-pan brassy copper cuprum ironwork iron gold golden spring gear cogwheel gearwheel screw-wheel rackwheel nut screw-nut female screw internal helix male external washer puck spacer collar rove shim wire spiral spire scroll loop volute wheel trundle castor roller caster rivet clench clinch clincher steampunk steam punk mechanical mechanic machinal power-driven orange yellow brown clockwork background texture pattern repeating continuous seamless