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Casey from SWISCO responded:
June 15, 2021
Hello, We'd be happy to help but we would need to see an undamaged balance removed from the window, including both end attachments, to compare to our inventory. Thank you! |
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Casey from SWISCO responded:
July 19, 2021
Hello, It looks like you have either our S351-18, with a 15-002 bottom attachment, or S390-18, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a 1720 spring strength option for your replacement balances. Also, take a look and compare our selection of face guides here to yours. Thank you! 
Comparison of the S351 and S390 balance shoes.
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