Window airing bracket

I know that this exact design is probably only useful for very few of you, but I still hope other can use it for inspiration. In our house the windows are hinged at the top. It is really nice that we can open the windows and they stay open, without having noises from a window ladge or something.

The only small problem is when you don't want to have the windows wide open, because if they are left just slightly open, they tend to close at the slightest wind.

Therefore I made these airing br