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  1. #2
    Just use one normal dial indicator. If you mount it on an arm, which can just be a bent piece of steel bar, you can take measurements at 4 points (i.e. 12:00, 3:00, 6:00 and 9:00 on the clock) and compare them to find how far out the spindle is in each axis. That tool is just a gimmick to make it slightly faster.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

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