Inexpensive alignment illumination
The lighting in my shop and the shadows it creates make it difficult to check the angle of the tablesaw blade with a square. As the saw blade approaches 90° it gets more difficult to see any gap between the square and blade.
I keep an inexpensive LED flashlight hanging on my tablesaw just for this purpose. It has a magnet that I use to attach the light to the saw blade just behind my square. Then I adjust the tilt angle of the blade until there is no light between the blade and the square—a perfect 90°.
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