I have 20-odd rectangular aluminium (aluminum) windows that need fly-screens.
Sounds easy enough to make my own, but along the bottom edge of each window is a window-winder (280 mm wide and 30mm high) that I need to work around. (This is the real problem I have - if you have another approach to solve this, I am all ears.)
I figured rather than a rectangular fly-screen, I would make a rectangular fly-screen, with a rectangular section cut out of the bottom edge. Slightly more complicated - it requires eight corner inserts, and a bit more care on which edge is the "inside" with the spline. I went and bought enough supplies for one window to make a prototype - including aluminium framing and EIGHT aluminium corner inserts, rather than the four required on most fly-screens.
I soon hit a problem. The rectangle along the bottom edge requires me to turn a corner, and then 30mm later, turn back again, to make a "dog-leg". But 30mm is less than the length of one corner insert, let alone the two I need to insert into the short vertical length of framing.
Here's an example of one of the windows:
In the bottom left, I have put an off-cut of the aluminium framing, with a corner insert pointing up, so you can see the problem.
Note: While the front of the winding mechanisms bulges up, it slopes back to being square at the back, so there is room for a straight piece. The mechanism is flush with the window when it is closed, so there is no room to go behind the whole mechanism.
If I can't use full-sized corner inserts, how do I secure the framing along the bottom side?