Janome Sewing machine - spring fell off

Question

Please help!My 2 year old son took it off and I cannot get the thing back on.It is in the little door on the left side. I see where it came from. Also, does this have anything to do with the thread getting too tight in the thread tension ( the step where you wind it down into the machine front). I have never been able to get past this problem. Help!!!It is the Janome 4618 le model.