Spring Loaded Balance

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Home Owner from Syracuse, UT

Dec 15, 2025 4:24 pm

The only identifying number I can see on these spring loaded balances is 3150 B.S.I.

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2 Replies

Casey from SWISCO

Dec 16, 2025 10:43 am

Hello,

It looks like you have either our S351-32, with a 15-002 bottom attachment, or S390-32, 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 3150 spring strength option for your replacement balances. Thank you!

Comparison of the S351 and S390 balance shoes.