balance

Hello, thank you for posting,

Your balance resembles the Series 350 channel balance. When measuring the length, only measure the metal channel excluding the nylon attachments. You will need to review the balance for a number stamped that will indicate the spring strength option needed.

If there is no number visible, you will need to obtain the weight of the window sash and compare to the strength chart on the product page. Please review the dimensions to confirm a good fit and let us know if you have any additional questions! 

Close up view of the S350 balance shoe.