Replacing 29-1/4" channel balance with 32-1/4 inch balance?

A home owner from Albany, New York says:

I have a Peachtree double hung window and I want to replace the existing channel balances. The balances for the top sash are readily available through your website. It looks like I need your S745, 22.25-4 channel balance. 

 However, the existing balance for the bottom sash is 29-1/4 inches measured from end to end of the balance. Your website lists 26-1/4 inch and 32-1/4 inch but no 29-1/4 inch balances. 

The existing bottom sash of the double hung window measures 38-1/4 inches from bottom of bottom rail to top of top rail so it seems like a 32-1/4 inch balance would work. The existing bottom sash weighs 28 pounds; the existing 29-1/4 inch channel balance is 1/2 inch wide and has the number 3666 on the back side of the channel. 

 Am I correct in assuming that your S745, 31.25-4 channel balance work for the bottom sash? Thank you for your assistance. Michael Kirby

Profile picture of Tom
Tom from SWISCO responded:

Thank you for contacting us. Unfortunately, the 29-1/4" balance was discontinued and is no longer available. The 32-1/4" balance, our S745-32, may work according to our notes, but I haven't tested it myself. I'm afraid I cannot guarantee it.

How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
VIDEO
WATCH >
How to replace a non-tilt channel balance
How to replace a non-tilt channel balance
GUIDE
READ >
Choosing a Non-tilt Channel Balance: What Will We Need?
Choosing a Non-tilt Channel Balance: What Will We Need?
GUIDE
READ >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.