Using the Bessey WS3 90 degree mitre clamp is easy. First, place your workpiece between the jaws of the clamp. Thanks to its automatic adjustment feature, it will fit variously - sized workpieces right away. Then, use the spindle to quickly clamp the workpiece in place. When using it, make sure not to apply excessive force as it's designed for light clamping work. For maintenance, keep it clean after each use. Wipe off any dust or debris with a dry cloth. Store it in a dry place to prevent rusting. With proper use and care, this clamp will serve you well for a long time.