tandem coil spring balance replacement needed

Hello!

You have our 15-087 pivot shoe that's designed to use the Series 180 coil springs and 15-086 housing. If your tandem housing is the only thing that's broken, you could get away with just replacing the 15-086. Just note, these parts are sold separately. Look them over and let me know if you have any questions. 

Certainly. With a sash weight of 21.6 pounds, you can use one S180-5 5 pound spring and one S180-6 6 pound spring on both sides of the window which totals 22 pounds of overall support. This setup should be just fine as long as the coil weights fall within a pound of your sash's actual weight. 

My pleasure! And thank you for your order! We really appreciate it. Let me know if I can be of further help and best of luck with the repair!