Balance spring




Thanks for reaching out! I'm happy to recommend a replacement for the coil balance spring you have. Although, I'll need to know either the stamps from the coils or the exact weight of the sash to determine the correct replacements. It would also be a good idea to confirm the width of the spring.
Please also include a photo of the tip installed to the bottom shoe.




Thanks for the additional photos. The coil spring you have here reminds me of the 1/2" wide Series 152 Coil Balance. If you are only looking to replace the coil springs, I suggest using the S152-9 Coil Balance. One coil on each side of the window will support 18lbs. To replace the cover you can use the 15-143 Coil Bushing, 15-144 Coil Bushing Cap, and the 15-145 Coil Barrel Support.
If you are looking to replace the entire assembly, the coil shoe you have here is no longer available but it can be replaced with the 15-199 Pivot Shoe. While I am confident it should work for your repairs, you'll need to be sure to compare the dimensions for the shoe.
This shoe would be compatible with the 1/2" wide Series 160 Coil Balance; specifically the S160-09. This is compatible with the 15-150S 1/2" Coil Single Support.
