Using your Chalk - Rite® Dura III Reel is a breeze. First, open the large refill port and fill it with up to 25 oz of chalk. Then, pull out the line and snap it down on the surface where you want to mark a bold 0.1 - inch line. When you're done, use the double - speed winding mechanism with the metal handle to quickly reel the line back in. As for maintenance, keep the case clean and dry to maintain its shock - resistant properties. Make sure to close the refill port tightly after each use to prevent chalk from leaking. Also, check the line regularly for any signs of wear and tear. If it gets tangled, gently unwind it to avoid damaging the internal parts.