Using the Jet 70440 parallel clamp is a breeze. First, decide if you want to use it as a clamp or a spreader. If it's for clamping, place the item between the jaws and adjust the position using the Slide - Glide trigger for precise placement. You can preset the clamping capacity with the moveable rail stand/end stop. Then, turn the Acme threaded handle to apply pressure until you reach the desired 1,000 lbs. of clamping force. If you need to use it as a spreader, simply reverse the movable jaw. When using the Precision - Rule™ measurement system, it helps you quickly figure out the opening capacity. As for maintenance, keep the clamp clean and dry. Wipe off any glue or debris from the non - marring composite resin jaw faces after use. Avoid exposing it to extreme temperatures or rough handling. Make sure to check the SUMOGRIP handle regularly for any signs of wear. If you notice any issues, it's best to get it serviced to keep it in top - notch condition.