Remis windowscreen blind loose

[Clickem]

The blind seems a poor fit at the left hand side and the whole plastic frame drops down, so the blind cannot slide across properly

How is it secured in place and how can I tighten it up?

 

[Riverbankannie]

There is a video of someone installing one from new here,

 

[Riverbankannie]

Looking at an online instruction pdf, it looks like the top cover is screwed into the van headlining before fitting the blinds themselves. B21
Broken Link Removed

 

[SpeedyDux]

Or the manufacturer's own instructions with pdfs in several languages that have lots of photos:

https://www.remis.de/mobil/service-ersatzteile/technische-informationen

I keep noticing other MH's front Remis blinds that are missing the Option Blende Unten (option bottom panel). This 2 piece option panel completes the system, because it blocks the gap under the front blinds where light gets in. Some converters don't bother fitting this panel. Gadget John's installation is missing this bottom panel, as can be seen in the video.