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The GDC has already answered this question:
http://forums.usfirst.org/showthread.php?t=11160
Quote:
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During inspection, acceptable tolerance on the Trailer Hitch altitude will be +/- 0.25 inches. During the MATCH, acceptable tolerance on the Trailer Hitch altitude will be +/- 0.50 inches, based on the dynamic motion of the ROBOT.
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