Best way to re-attach?

[Kingpin!]

I saw this today and wonder if someone has experience of how to best tackle that it has come loose a little bit in the end.

It may seem like a small problem but I spotted this from a distance and it immediately looks like a less well-maintained car.


Thanks!

 

[KillerHERTZ]

Double sided trim tape from Hellfords. Very strong and waterproof.