While you wait for answers, we may have found some information which could help you.
Click here for Vertical Blinds OpenHow to retension a Velux blackout blind GGL4?
how can i reglue my honeycomb shades?
Replacing cord for high Velux window?
How do I open Velux blind completely stuck?
how can i shorten the width of my levolor vertical blinds?
I need to shorten draw strings ?