I’m helping a friend with a Gottlieb Time Line. Key to the backbox is missing (yes i have looked inside the coin door, lock is drilled out here as well).

We have drilled out the lock in the back box but we still cannot lift the backglass out of the backbox.
Any pointers at where to try to push at the locking mechanism?
I cant find any pictures online which shows how it works.

Thanks

Cheddar
I got this video from a fellow collector. that whole bracket has dropped down inside the backbox

I wonder if its possible make it turn with like an angled screwdriver