In pulling it fails!

The attached alcohol wipe the window is cleaned quickly. The attachment is well explained. Actually I wanted to stick the hook a little further to the right, but barely touching the adhesive surface of the plastic window frames, because they could no longer take off! Really extra strong adhesive strength!
The controller hooked initially brought the desired result. Previously the window has fallen repeatedly on tilt. Now it remains open. Just what I wished for!

Supplements and deduction of points:
As the first violent wind came with passage in my apartment, the controller broke off. Now I have useless and chunky Bonds rush by the window, because the control arm no longer holds. Too Bad. Threading does not stand these plastic obviously.