With an adjustable dado blade, it’s hard to tell which tooth cuts farthest to the left and which cuts farthest to the right.

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With an adjustable dado blade (sometimes called a "wobbler"), it's hard to tell which tooth cuts farthest to the left and which cuts farthest to the right. Find the widest-cutting tooth—or teeth, in the case of the dual-blade adjustable dado, shown—using a square. Then label that tooth's post with a permanent marker. Now you can measure from that tooth when setting up your cut.