Don't be fooled by what you may have read. Champion 7989 plugs are NOT one peice.
Look at the picture, see the blue color in the groove to the right of the threads, that is a laser weld. No welding necessary if it were one piece.
Look at the picture, see the blue color in the groove to the right of the threads, that is a laser weld. No welding necessary if it were one piece.