Casey from SWISCO responded:
May 20, 2020
Hello, It looks like you could be using with S380 or S385 channel balances, depending on the depth of the bottom attachments as shown below. If these never worked correctly, someone probably installed the incorrect spring strengths, which is what those stamp numbers indicate. I recommend weighing each window that is a different size and choosing your spring strength options based on the charts under our product descriptions. Thank you! Comparison of the S380 and S385 balance shoes.
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