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Lauren from SWISCO responded:
October 9, 2023
Hello, thank you for posting, To further review, we will need to see closer images of the top and bottom nylon attachments. From there we can narrow down to determine the Series your window uses. For the stamps, is the 2840 and 28C from the top and bottom sashes? The balances should have the same stamp for either side of the sash, but can differ from top to bottom depending on the weight. Thank you! |
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Lauren from SWISCO responded:
October 10, 2023
Thank you, It appears you have either the S351-29, with a 15-002 bottom attachment, or S390-29, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. A 2840 stamp can support a 23 to 28 lb pound sash. The 28C stamp should translate to a 2830 stamp and can support a 16 to 23 lb pound sash. I recommend weighing the sashes to confirm the best option. The balance should have the same stamp on either side of the sash, but could differ between top and bottom sashes. Please review and let me know if you have any additional questions! 
Comparison of the S351 and S390 balance shoes.
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