zoomkat, Thanks for that and the illustration. Pictures are always good.
Just out of interest... I have a motor shield with 2x servo contacts on it. I havent opened it up yet as I have spent my time looking inside the servo. Would the shield get the current needed to run the servo or do I still need an external power source?
If I do need an external source, what is everyone using? Is it one of those plastic 4xAAA battery packs??
Thanks for your help