I had a little jitters to fuschen our windows around. But the Reer window and balcony door locking really could be attached quickly and easily. The instructions for use stated in ten exquisitely detailed sketches itself Handyman Noobs like me very obvious what to do: 1. Aperture prefer 2. Turn the aperture 3. Place the jack from closed to open 4. rausdrehen screws 5. Remove the jack 6. Place the fuse to the place where previously was the jack Push in 7 bars, while touches the latch again Reindrehen 8 screws Push in 9 bars, while rotating the handle from open to closed 10. Aperture just turn and press again Ready! If you would like to operate the jack, you must press the latch in the backup. When you reach the desired position (open, closed or tilted), you can just start and the latch snaps back. The mechanism is working properly. The resistance which the bolt when Rein Press makes is pretty crass. Especially in the first period. I had to spend almost all my strength. And after that I hurt my thumb, because the bar is a little narrow. But that's about my only, minor criticism. A slightly larger printing area would make the impressions comfortable. After a few weeks with daily airing of resistance has eased somewhat, so I can handle it better now. I was the Reer window and balcony door locking very confident. It is safe and easy to use and assemble. The price performance ratio!