1, line-lead-junction
2. Process
(1) line: cut a line slightly longer than the arm.
(2) Needle threading: thread the thread into the eye of the needle.
(3) lead wire.
(4) knotting: knotting.
(5) Positioning: Determine the position of the button and aim at the buttonhole on the clothes.
(6) needle insertion.
(7) Knotting: Stop knotting.
3. Recall the precautions for nailing buttons.
Position, pinch, align buttonholes and insert pins, repeat four or five times with the front and back of double threads, then tie knots and cut off redundant threads.
Teaching and learning process
4. Preventive measures
(1) The position of the button should be aligned with the buttonhole on the clothes. You can mark it with chalk.
(2) After the needle is inserted, the needle and thread should be lifted upward, not sideways, so as to avoid the needle tip poking others.