The Makita 631218-8 Controller helps regulate the electrical functions of compatible Makita miter saws for reliable operation and consistent cutting performance. It works by controlling the flow of power between the switch and motor, supporting smooth startup, stable speed control, and dependable tool performance during operation. Made to replace a faulty or damaged controller, it hel... https://www.wholetoolbox.com/makita-631218-8-controller/631218-8.html