I assume the spring you are talking about is the small pin type implement that allows the bezel to click and keeps it from going clockwise?
Are you sure it is there at all? When you took the bezel off, what precautions did you take? I ask this as this pin shot off when I took mine off, and advice at the time was to take the bezel off whilst holding it inside a bag, so that the pin at least shoots off in the bag.
If it is there, then I would take the bezel off an reinsert. But first, I'd trawl some youtube video's to double check that I'm doing it right. Good luck.