Thanks to CJH for his PDF guide and all the posts by other forum users (itchy, kev etc) on this type of carb, it has really helped me understand how it all works.

You can watch the video here: https://www.youtube.com/watch?v=amnqCUSTnUw" onclick="window.open(this.href);return false;
It's my first attempt doing a video like this, hope it's useful!