While you wait for answers, we may have found some information which could help you.
Click here for Window Roller Bhow can i fix a velux blind?
How to retension a Velux blackout blind GGL4?
how to reattach the side clips on velux blind?
how can i re attach the cord on my velux blackout blind?
Finding spare mount brackets for Velux pleated blackout blinds?
How do I open Velux blind completely stuck?