Using the Jet JT9-70460 parallel clamp is easy. First, decide whether you want to use it for clamping or spreading. If clamping, position the item between the jaws and use the Acme threaded handle to turn and apply pressure. The Slide - Glide trigger can help you make precise adjustments quickly. For spreading, reverse the movable jaw. When using the Precision - Rule™ measurement system, it'll help you set up the clamp accurately and know the opening capacity at a glance. As for maintenance, keep the clamp clean. Wipe off any glue or debris after use, especially from the non - marring composite resin jaw faces. Store it in a dry place to prevent rust. Be careful not to over - tighten the clamp beyond its 1,000 lbs. pressure limit, as it may damage the tool. Also, handle the SUMOGRIP handle gently to maintain its soft grip functionality.