Lauren from SWISCO responded:
April 3, 2024
Hello, thank you for posting, It appears you have either our Series 351, with a 15-002 bottom attachment, or Series 390, with a 15-001 bottom attachment. Take a look and measure the image below to determine which balance you'll need. You will need a 25" balance with a 2430 stamp option. Please review and let us know if you have any additional questions. Comparison of the S351 and S390 balance shoes.
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Lauren from SWISCO responded:
April 4, 2024
Thank you for the additional information. If the depth of the shoe matches up best to the 1" verses the 1-1/8" measurement, the Series 351 would be the best option for your window. You do not need to worry about the distance of the spring. Like you mentioned, your original balances could have been manufactured by a different company. Your original balance is stamped with a 2430 that indicates your window sash weighs between 15 to 19 lb. As long as your sash is in that range, the S351-25 with a 2430 will support the window. Please let me know if you have any additional questions! Comparison of the S351 and S390 balance shoes.
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