Using the DeWalt chalk reel is easy. First, fill the reel with chalk. Then, hook the reel onto the surface where you want to mark. Pull out the string as far as you need and hold it in place. Snap the string against the surface to leave a clear chalk line. When not in use, keep the reel in a dry place to prevent the chalk from getting wet. To maintain the reel, clean the felt gasket regularly to ensure even chalk distribution. Also, check the stainless - steel hook and crank arm for any signs of damage. If you notice any issues, replace the parts promptly to keep the reel working well.