Block and tackle window channel balance 3020 BSI
please tell me what to order. thanks
What does BSI mean?
I need window 3020 balances
Handy Person from Delray Beach Florida
Feb 3, 2026 8:40 pm
3 user uploaded images
2 Replies
Casey from SWISCO
Feb 4, 2026 4:07 pm
Hello,
BSI is the manufacturer of the balance. Your photos resemble the S377-31 (3020) channel balances. Review the specifications to confirm it's a match. Thanks for posting.
How to measure the length of the Series 377 channel balance.
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