Making my own Retractable flyscreens - Advice

I have casement windows, which make fly screens a bit of a pain. I've tried a few solutions and I think the retractable screen seems to be the most convenient. Unfortunately it is also very expensive (looking at $200 a window).

So I want to try and have a crack at making my own. Basically what I was thinking was I'd have a roller at the top of the window frame which the flyscreen goes around. Down the sides of the window frame will be tracks which will hold the flyscreen in place and I'd either hold the flyscreen down at the bottom of the window frame with magnets or a hook.

What I'm not sure on is what to use for the roller. It has to be something which is loaded with a spring or something so that when I need to retract it, it will roll the flyscreen around it.

Does anyone have any ideas? If I can figure out the roller part I will buy some parts and do a trial on one of the windows and see how it works.


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