Casey from SWISCO responded:
October 25, 2021
Hello, With this combination of attachments, you could have either an S380-18 or S385-18 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. Your stamp code would normally indicate that you need 1740 spring strength options for your replacement balances. Since you said that none of your windows are being properly supported, I would recommend weighing the window sash and following the chart under the balance product description to confirm that you choose the correct strength option for your windows. Thank you and let us know if you have any other questions or concerns. Comparison of the S380 and S385 balance shoes.
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