How to untie the secondary line and the main line

The schematic diagram of the secondary line and the main line tied together is as follows.

1, the main line is an eight-character ring. Thread the end of the main line and the lead base into the unexposed end of the eight-character ring and wind it several times.

2. The secondary line is connected to the main line. Fold the hook line in half, and pass the line at one end of the fold through the figure-eight ring to form a knot. Don't tighten it yet, pass through the middle of the two lines at the head of the folding line and pull hard.