While you wait for answers, we may have found some information which could help you.
Click here for Vertical Blinds HelpHow can I fix my velux blackout blind GPL 308 with broken cord?
Finding spare mount brackets for Velux pleated blackout blinds?
how can i fix a velux blind?
how to reattach the side clips on velux blind?
velux drawstring cords?
Replacing cord for high Velux window?