I'm working on a fixer-upper, and I needed to repair the screens. In order to remove the screens, I of course needed to lift the window all the way up. However, there was a bracket blocking the window's travel:
"No problem" I thought. But when I unscrewed that phillips screw, the rod just shot out of the frame. It sounded like a gunshot and took a chunk out of my hand. Same was true for the other side of the frame (though I was smart enough to wear gloves).
After the brackets came off, the rods moved freely back and forth. The window still opened and closed just fine, but it wouldn't stay up. It seems that the rods are under a lot of tension and hold the window in place when it's opened.
It seems that the rods can be screwed in. If I turn them counter-clockwise, the resistance builds up, and if I let go, they quickly spin back to their starting point. But after mucking around with them for a bit, it's not clear how to properly restore their function.
Here's what the right side of the top of the bottom window looks like where it meets the rod:
I'm definitely willing to read a manual if I can be pointed to it; I just haven't had any luck finding information about this type of window.