How to Use a Slide Rule

Invention on Instagram: "Countersinking screws is a method used to create a small conical recess so the screw head can sit level with or below the surface of the material. This technique is common in woodworking, metalworking, and construction because it improves both the look and the function of the final product. When done properly, it prevents sharp or uneven screw heads from sticking out and catching on other materials or surfaces. It also helps with strength and precision. When a screw head