Stanek window
Hello there. It looks like you need a new spiral balance. We can help, but we'll need a few details to narrow this down for you. First, I need the length and diameter of the outer tube, up to and not including the tip from which the spiral rod protrudes. Second, please send us a picture of that tip; it should have a certain color to it which is key for identifying the strength of the spiral balance. Finally, if you need to replace the pivot shoes the spirals attach to, please remove one and give us its width and thickness. That will help a ton in narrowing down your options. See the videos below for guidance on identifying spiral balances, as well as removing and replacing these components from the window.