Preparation materials: needle-nosed pliers, ruler, copper wire.
1. Measure the same size with a ruler with needle-nosed pliers and cut it off;
2. First prepare a copper wire, as shown in the figure, hold one end with a needle-nosed pliers;
3. Winding of such coils;
4, the two ends are wound like this;
5. Then select a point on the center line;
6. Fold it into a picture;
7. Just fold it again.
8. Chess pieces can be linked together;
9. Series connection;
10, finally finished.