Speedy Cord lock for Roman blind kits. If you have a Copes Roman blind kit then it is likely that it is a copy of the Speedy blind kit and will therefore use the same components.
This product includes access to a video demonstration of how to thread the Speedy window blind cord lock.
Very popular and robust cord guides used on these kits from around 2007.
You can also buy access to oomtoo separately and view the video once logged in 😉