New 3DS XL 3d slider

I have a New 3DS XL, and have had it for almost a year, and the gray piece on the 3d slider fell off. Is there any way to attach it again, or will I have to buy a new slider altogether.

Usually if the slider falls off it’s broken under the screen. You can remove the screen protector and put on a new one but they can be difficult to remove.

I am talking about the gray piece on the 3D slider, not the entire thing.