1 – Put one end of the wire through the hole on the bow terminal, on the opposite side of the spring.
2 –
Wrap the wire around the terminal as shown in the picture.
3 – This is how it should look like when done
4 – Put the other end of the wire through the loose end of the spring, and pull it using a plier.
5 – Pull the wire until the spring reaches 10 cm end-to-end.
6 – Bend the wire to lock the reached position (spring extension) in.
7 – Wrap the wire onto itself to secure it. Cut any exceeding portion away.