I managed to get a reply from a friend in China and here's the instructions. It says pop the rubberband around the bamboo and that's it!
The tiny brass pulleys are really smooth, could be the reason that keeps the wings folded - speed - as it race down the kite line, just using my imagination.
Anyway I will try it (hopefully today) if the wind's up, I will take a video
Thanks again for all the thoughts.