How to put back bottom mouse keys on my X201 ?

[Imax]

Dear all
I did numerous searches over the internet or in the forum but I cannot find an answer to my problem

I spilled a bit of water on my X201 keyboard and had to remove the 2 mouse buttons (Left and right bottom black keys, not the keys with a small red line) for cleaning, however now I cannot figure out how to put these 2 buttons back in place ?

There are 2 small metal pieces but I have no idea how to correctly fix them

Is there a video or any tutorial somewhere that could help ?

Many many thanks