Swanson Big 12 Speed Square for Stringers

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How to use a speed square.  This video shows how to assemble a Swanson Big 12 speed square layout bar and demonstrates 4 other uses in addition to the layout of stair stringers with adjustable stair tread and risers settings. I had to lower the risers to 7 1/4"  to keep the over all angle at 36 degrees.

1.  Marking lumber for out of square cuts
2.  Marking 90 and 45 degree angles
3.  Scribing marks for rip cuts
4.  Saw Guide
5.  Layout stringers

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