Caldwell window balance spring

Thank you for reaching out to us. We can help with this. We'll just need a few more details to ID your hardware. We would like to see an image of the inside of the balance’s metal channel, where the innerspring connects to the pulley mechanism; this connection is located in the middle of the channel.

Thank you! Your balance appears to match the S351-34 or S390-34. The best match will depend on the depth of the bottom shoe, as shown below. You can also select the 3340 stamp option for your replacement balances.

Please let us know if you have any questions.

Comparison of the S351 and S390 balance shoes.