curtains hook

I have some PVC Windows, and it's very hard to find hooks
I found hooks which pinch the rubber join, but after fews month, the join keep the form and the wind can enter
I found other hooks with sticker, but after few mounth, the stickers are dry and the hooks fall
So I decided to design mine
If you print this model, you have just to put a nail and one point of hot glue

you will be able to remove easilly the hook without any dagradation on your windows