Slide the tray forward until this dimple is visible.
Only the right side of the frame is shown but there is a dimple on both sides. (see arrow in photo)
Use a hammer and center punch to make the dimple a little deeper. Do the same on both dimples. Very little force is necessary.
If the dimple is too deep the ball bearing will not be able to pop out easily when the tray is pulled and therefore the tray will be stuck in the closed position.
