A circle of steel from the van body, a zinc coated steel nail, two untinned pieces of copper cable and (bottom right) tinned copper cable.

A circle of steel from the van body, a zinc coated steel nail, two untinned pieces of copper cable and (bottom right) tinned copper cable.

A circle of steel from the van body, a zinc coated steel nail, two untinned pieces of copper cable and (bottom right) tinned copper cable.

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