Good idea, but bad implementation!

Mechanism can only be with a lot of press force (and I am not petite built). You can operate the mechanism only with äuserster of force !!
This mounted the operation close to the window frames has one only with your fingertips the ability to part the drückem pure. As a woman, one needs to have two hands for it.
The window with "normal" window handles have a very wide wooden frame. If the fuse is installed in the correct direction (locking mechanism toward glass), this can not be operated. After several try the part then also fails his service and the mechanism is now stuck. Would recommend in any case!