sash balance 2970 BSI og 30

A home owner from San Diego, ca says:
June 13, 2011
I need to replace about 28 balance of different sizes. The window were manufacture by windowmaster in san diego in 1992. The number on this balance is 2970 BSI og 30. I would like to know what series they are so i can replace. I'm sending you some picture.
User submitted photo of their 2970 BSI og 30 balance.
Profile picture of Mike
Mike from SWISCO responded:
June 22, 2011
You need our S385-30 channel balance with the 2970 option. Let me know if you have any further questions.
A home owner from san diego says:
June 27, 2011
I was wondering if we should order 2-balances to make sure we have the right ones
Profile picture of Paul
Paul from SWISCO responded:
June 27, 2011
Well, we do recommend that you replace both balances and not just one. Replacing both window balances at the same time prevents extra wear-and-tear to the new balance, which will have to work twice as hard when paired with an old balance.
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 4-7 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at 856-317-6263 or at help@swisco.com.