My DS Lite's top screen wobbles. Are there any fixes?

Unless my DS Lite's screen is clicked all the way back, it wobbles at the slightest provocation. It's not much of a problem with my only game, Spirit Tracks, but I can see it being a problem for games that don't use the touch screen as much. Is there any way that I can fix it in place without having to buy a new one? Because it's already getting on my nerves, and I just got the damn thing.