Replacement Part Numbers

Hello, thank you for posting,

It sounds like you are in need of a new non-tilt channel balance. To further review, we will need to see one of the balances removed where we can see a clear view of the top and bottom nylon attachments. We will also need to see the inside of the metal channel where we can view the connection point between the spring and pulley system. 

From there we can confirm the series your window uses. Thank you!