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A correction to the video: You don't need to measure "to the front" as RJ The Bike Guy says (the rim section behind the seat tube). Three points form a plane (flat surface), and it's a pain, particularly when using the Park Tool, to position the tool in that location. Top, bottom, and to the rear will provide all the points you need to accurately align the derailleur hanger.
Error of +/-4mm will provide accurate shifting.
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