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The number worth remembering from the new Rolls-Royce Phantom Hummingbird isn’t 53, or 84, or the nine months of development. It’s 0.06 millimeters — roughly two-thirds the width of a human hair, and the amount of extra material Goodwood had to leave on every single fragment of shell before cutting it. A laser beam has width, and it burns away material as it travels. Cut to the finished dimension and the piece comes out undersized. So every piece was cut oversized on purpose, then filed back down by hand, edge by edge,…