Curtain holder for window curtains

This is one of those things that break all the time. Small wind, window force shuts, curtain comes down because one of the holders broke again...

You'll need some kind of thick wire or a small nail for the pin (hole is about 2mm, if printed with shrinking material a bit smaller). I used AWG-13 copper wire (up to AWG-15 should work too but you would have to glue it in)

Just put some double sided tape on the back and stick it to the window frame.