The credits of the clip is shown.  A person mends steel with a welding equipment.  A person uses a hammer and a flat equipment to remove debris.   A person uses a flat equipment to remove melted steel debris.  The person places two dumbbell shaped steel in opening that he is welding.  A person uses a flat equipment to clean the welded opening.  A person uses a flat equipment to move the dumbbell shaped steels and then removes them with his hand.  The credits of the video is shown.