Start by twisting the spring backwards until it clicks into the diagonal opening in the cap.

With the spring end in the cap groove, turn the spring in the opposite direction to unscrew it over the cap until the base of the spring passes the yellow indicator.

With the main spring decompressed the straps can now be safely worked back into a correct shape. Pliers can be used , but if the straps are broken or badly kinked they will need to be replaced.