CD tray does not open

I still use this old but beautiful iMAC for some software and to read small CD sizes that new MACs do not accept anymore (you need to place them on a tray). But the iMAC G4 CD tray refused to open.
A few years earlier we managed to repair the screen backlight years ago (mentioned in my book TOXIC CAPITALISM).
I needed to read a small size CD and realized the tray got stuck. There were some faint click-clacks but that was it.

The solution

Out of desperation I poked around the tray, trying to pull it out, with the lid opened. Finally I pushed inside the white plastic (see pic 4), which “clicked”, see pic 5.

 

Then with the keyboard I opened the tray that slides out.
Simple, works…