Window balance

A professional from Cupertino ca. says:
April 28, 2020
Viking 3-0x4-0 single hung from home depot. I believe it's part 21" SERIES 385 CHANNEL BALANCE 2030 ? This for my home. Been a carpenter for 40 years and never replaced one of these. Installed many of these windows.
Thanks Don
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Donna from SWISCO responded:
April 28, 2020
Hi Don,
I think it looks more like our Series 395, no wings on shoe.  You are in for a treat, these are the easiest balances to replace, honestly.
Also take a look at the top sash guides while you have the window sash out, they may need to be replaced if they are damaged.
Let us know if you have any other questions, we are happy to help.
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