Now, 100 years later, you can still use this multitasking wonder as a scribing tool, a protractor, a miter square, a try square, or even a saw guide. It makes easy work of everything from building ...

This common practice uses a hard, rounded tool to crush the fibers along ... usually produced by a miscalibrated miter saw-- or to create a square build. Structurally, such a minor imperfection ...