EDIT: I designed another version that doesn't need glue. It still stays in tightly, but it needs supports and doesn't stay as tightly as this one. You can find it here.
The tray broke off on a Labyrinth marble maze game that I have, and I lost it. I designed a new one that has holes so the marbles stay in better and super-glued it on. It has worked perfectly so far.
https://www.youtube.com/watch?v=ehzaAG9m41Y