Window mosquito screen hook and corner

I've created this corners after all off my windows screen fittings literally turned into dust. I've bought some fixtures that almost fit into my frame but where about 1mm smaller and used them as start point. I've used coPET in hope that it will survive sun and outside weather for long time.

Hook, custom design, I always afraid that this thin stock plastic handles will breaks and lost my net. Actually few times it's happened I've managed to catch my net, so I've designed this one with metal cable and holder to avoid this. The length between screws 2cm.