Norm's Technique on how to find the centerline as part of a this old house tool test
Illustration: Gregory Nemec
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Norm's Techniques: Find the Centerline.

1. Draw a line across the board 90 degrees to both edges.

2. Use the 45-degree face to draw a line from the point where the 90-degree line meets an edge of the board.

3. Flip the square over to the board's other edge and draw another diagonal, as shown, from the opposite end of the 90-degree line. Where the diagonals intersect is the centerline.
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