Keyboard key coming loose on a Dell Latitude 5880

I have a Dell Latitude 5580 laptop. On the keyboard, one of the keys is loose. I need help to fit it in place. I have inspected the mechanism, nothing appears to be broken. The tiny metal mount looks intact. The tiny white scissor mechanism appears intact. The black key cap is definitely intact. It looks to me that the white scissor part is not stuck properly onto the metal mount, because it is the front-facing side (closer to the space bar) that comes loose. When that happens, the front part of the key cap is lifted a little so the key cap is sloping away from me. It is so tiny that it's hard

Question by Torben Gundtofte-Bruun on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.