That's unlucky about the pull cord, it's usually a wheel that's the first thing to fall off on your first time out :-D I found this forum a great help in my times of need, this thread alone has 700+ pages lol. Do you have the manual with an exploded diagram of all the parts? I downloaded a pdf file off Google which can help you mentally strip something down before you start so at least you have an idea of what components a part contains. If you think it's come undone somehow and not snapped then it's worth investigating yourself, take pics on your phone as you go for reference and you shouldn't go far wrong bud