Replacement spring balance

A quick learner from Idaho says:
August 18, 2023
The spring balance string broke. The window is about 28 lbs 26 3/4 " tall 44" wide. The metal part of the balance is 24". The markings in the photo are 23 5 BP Caldwell. The top piece on the other balance is missing part of the plastic but seems to function fine. If this balance is properly sized for the window l need an equal replacement. If it is not properly sized what size should I get?
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Casey from SWISCO responded:
August 21, 2023

With this combination of attachments, you could have either the S380-24 or S385-24 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. 

The 23 5 stamp on your balances indicates that you would need 2350 spring strength options for your replacement balances but keep in mind that they will be calibrated to support a window sash between 23-27 lbs. If you're sure that the window weighs 28 pounds, we also offer the 2360 strength option to support between 27-30 Ibs.  Thank you and let us know if you have any other questions or concerns.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.

24" Series 380 Channel Balance
24" Series 380 Channel Balance
S380-24
$10.55
24" Series 385 Channel Balance
24" Series 385 Channel Balance
S385-24
$10.55
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