Using the Abaco Heavy - Duty Barrier Lifter is easy. First, make sure the lifter is in its idle state with the clamps open. Position it around the stone slab or block you want to move. Once in place, start lifting. The gravity - controlled mechanism will automatically close the clamps around the material. When you're done moving, gently lower the load, and the clamps will open as it reaches the ground. As for maintenance, regularly check the vulcanized rubber and clamp plates for any signs of wear and tear. Keep them clean to ensure maximum gripping force. And always check the weight of the materials you're lifting to stay within the 7040 lbs (3200 kg) limit. This will help keep the lifter in good working condition and ensure your safety.