Window balacer

Hey there,

Thanks for reaching out! I've narrowed down your balances to a few possible replacements. I'll just need to see a photo of the pulley system on the inside of the balance to identify the exact balance.

Please don't hesitate to reach out with any questions you might have.

Thanks for getting back to us. With this combination of attachments, you could have either the S380-16 or S385-16 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. 

You'll also need 1530 spring strength options for your replacement balances. Thank you and let us know if you have any other questions or concerns.

Comparison of the S378, S380 and S385 balance shoes.

You would need 1530 strength options based on the 15 3 stamp code on your original balances, which will support a sash between 10-12 pounds. The 1510 options you purchased will only support a 4-6 pound sash, which is why your window will not stay up. Our return policy can be found here to send back the balances you purchased.