Sash balance repair

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Home Owner from Bolingbrook, IL

Mar 1, 2026 9:44 pm

The stamping on it says 2740 B.S.I

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4 Replies

Bob from SWISCO

Mar 1, 2026 10:06 pm

Thanks for posting. See the S351-28 or S390-28. The only difference between these two balances is the depth of the bottom shoe. See below. Measure your old balance's shoe depth to see what matches best. For a stamp option choose 2740.

Comparison of the S351 and S390 balance shoes.

Home Owner from Bolingbrook, IL

Mar 2, 2026 8:25 am

Thank you for the response. It is 390 series, since the depth is 1 1/8th of an inch.

Bob from SWISCO

Mar 2, 2026 3:07 pm

Great! Let us know if you have further questions.