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Casey from SWISCO responded:
June 7, 2022
Hello, It looks like you have either our S351-31 , with a 15-002 bottom attachment, or S390-31 , with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need to locate the stamp code printed on your 31" balances to choose the corresponding spring strength options for your replacement balances. Thank you! ![]() Comparison of the S351 and S390 balance shoes.
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Casey from SWISCO responded:
June 7, 2022
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