Springs for Bonneville windows

Windows were installed new in 2002. I believe they are Bonneville windows. The windows are very difficult to open now, and some click when opened (assuming spring is bent). The windows are double hung vinyl. I have 2 different size windows, 18" and 28" tall (individual pane size). One window has a damaged pin (IMG_3323). I would like to purchase enough to replace all the springs in my windows; 10 of the 28" windows (will need 40 of those springs) and 7 of the 18" windows (will need 28 of those springs). I haven't removed the springs yet, can if needed. Happy to provide any further info required.
Thanks,
Mike



Hi there!
We'd be happy to help, but we'll need to see an undamaged pivot shoe removed from the window, along with dimensions to compare to our inventory. If we can identify the pivot shoe, that will tell us the coils and accessories that you'll need.
If you need a new pivot bar, we'll also need to see it removed from your window along with dimensions.
Thank you!

Please find attached pics of the pivot shoe.
Thanks,
Mike



Thanks for the additional pictures, Mike!
Please see our 15-111 pivot shoe which uses the Series 160 coil springs. Compare our dimensions to yours and see how they match up.







Hello! Yes, the 4 and 5 you see are the stamps in question.
Concerning how these springs attach, they are meant to stack; the bottom spring attaches to the shoe, the second spring attaches to the bottom spring, and so on. Think of it like a barrel of monkeys. If both of your springs attach to the shoe in your current assembly then the explanation is simply that whoever installed it didn't know how they were supposed to work.