To use this Lincoln Caliber Collet Body, first make sure your TIG torch is of the 17/18/26 type. Insert the tungsten electrode into the collet body and ensure it's held firmly. Then, attach the collet body to your TIG torch. When welding, the collet body will direct the gas to the weld puddle. As for maintenance, keep it clean and dry. After use, wipe it down to remove any debris. Avoid exposing it to extreme heat or moisture for long periods as this could damage the copper alloy body. Also, check the fit of the tungsten electrode regularly to ensure it's secure.