Replacement Balance Springs

Thanks for reaching out to us. We're happy to help with this. However, we'll have to see the pivot shoe first to identify the compatible coil springs. Let me know if that's something you can get for us!

Yes, thank you! We don't sell this exact shoe but the 15-199 is similar. This is designed to be used with the 1/2" Series 160 and 3/8" Series 165 coil springs which look similar to your old one. You'll have to measure the width of the old spring band to determine the best match.

I'm assuming your window uses one 9-pound spring on each side of the window to support an 18-pound sash but please correct me if I'm wrong! 

If I assume right and the spring band is 1/2", you can use the S160-9 9-pound spring on each side of the window.

If the spring band is 3/8", I recommend you use one S165-4 4-pound spring and one S165-5 5-pound spring on both sides of the window. This equals 9 pounds of support on each side, totaling 18 pounds of overall support. You will also need the 15-204 since this will be a double spring setup. 

Let me know if you have any questions! 

I'm happy I could help. Take care and best of luck with the repair!