Window sash balances

Home Owner from Chicago
Moved into new condo and one window wasn't working properly. After pulling it apart, the problem was only one side had a sash balance.

Stamp shows 37DS BSL PN 40

1/2 in channel

The metal seems to measure 38in though so I need to confirm what I should be buying.

Window weighs 40 lbs Forgot to mention. It is a single hung window, not sure if that makes a difference.
Channel balance
4 Replies
Tom
Tom from SWISCO
SWISCO
Expert
Thanks for contacting us! This balance appears to match our S390-38, but with a special strength spring for your heavy sash. We can make this for you but it will need to be a custom order. Before we begin, can you tell me how many you need? Did you just need one, or did you want to replace both balances on the same sash?
Quick Learner from Chicago
I actually would want 4 of them because I have another identical window that isn't working well right now.

Let me know about pricing.
Tom
Tom from SWISCO
SWISCO
Expert
Great, thanks. I'll email you a custom order link and price quote for 4 right now.
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