Using the DeWalt DWHT47374L chalk reel is a breeze. First, open the 1/4 - turn cap and fill the reel with the 4 oz red chalk provided. Then, pull out the 100 - foot chalk line as far as you need. The 3:1 gear ratio makes retracting the line quick and smooth. When you're done, fold the handle flat against the body for easy storage. To avoid line jams, try to keep the line straight when pulling it out and retracting. Also, don't drop the reel often as it might damage the over - molded grip. For maintenance, clean the chalk reel regularly to keep it in good working condition. If the line gets dirty or frayed, you may need to replace it. And that's all you need to know to get the most out of your DeWalt DWHT47374L chalk reel.