Microsd tray repair: it doesn't hold the card

As the title says, I can't fix it, the sd enter but there is no "click", and It doesn't hold it.

I attached the photos of what I have, and the other part is part of the motherboard. Where does the metal pin go? Is the plastic part correctly assembled? Any ideas?

I can add some photos.

Thank you

ps I'm working on a Cube Mix Plus