The locking mechanism didn’t flex enough and the entire adapter broke.
Feels sturdy enough, works as intended and arrived quickly. Can't complain.
The part which was delivered, is ok. But the grip consists originally of two parts: one, which was delivered and an additional one, which is connected as hinge to it and which grips on the other side over the bottom ridge of the roller curtain.
This arrangement is also shown at one of the pictures on Your web page.
As this second part is broken in my case, the part delivered is useless for me.
What a pity. Best Regards.
Perfect fit and good for clean looking desk