Identify Window Channel Balance

A quick learner from Winnebago, IL says:
Metal frame is 1/2" x 28"
Code stamped on metal frame is 2730

Thumbnail of the uploaded file named IMG_7099.JPG
Thumbnail of the uploaded file named IMG_7100.JPG
Thumbnail of the uploaded file named IMG_7101.JPG
Thumbnail of the uploaded file named IMG_7097.JPG
Thumbnail of the uploaded file named IMG_7098.JPG
Profile picture of Bob
Bob from SWISCO responded:

Thanks for writing in. It appears you have either the S351-28 or S390-28. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below for reference. Compare both with your old hardware to see what matches best. In either case for a new stamp option choose 2730.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

How to Replace a Non-Tilt Channel Balance
How to Replace a Non-Tilt Channel Balance
VIDEO
WATCH >
How to Repair a Jammed Window
How to Repair a Jammed Window
VIDEO
WATCH >
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.