Wipe off the dust of the painted surface to be attached. Please take a small amount of water back of sucker (suction surface). Set electrode free state by loosening wing screw. Then absorb 2 suction cups. insert stud welding machine grip into shaft. Push until electrode and steel plate sticks. On stud welding machine side, make tip or brass part of grip have contact with steel plate. Energize and weld electrode to steel plate. Setting is washer welding. Confirm electrode is welded, tighten wing screw. Do not operate for long hours. Steel plate get high heat and suction cup may weld and get deformed.