Hymer flyscreen repair

[mygrassisblue]

Flyscreen on large side window went ping last week and the whole thing unravelled so I am thinking the spring has either snapped or dislodged itself.
Has anybody tried to repair one of these before, any advice welcome as we are in Portugal and fly season is here.
I have repaired a small Autotrail blind before and that was a nightmare.
For info van is 1998 Merc S510.

 

[mygrassisblue]

Thanks *****,
Unfortunately the van is an older model and the window frame is a single moulded piece.
I checked a 2002 Hymer on the same Aire and he had the corner pieces so must be a mod since my van.
There are 3 screws in the side runners where the blinds move, I may take them out and see if the frame is removable then.