Looking for replacement window part

A quick learner says:
Looking for replacement part for a single hung window. The sash spring is broken so I would like to verify the correct replacement part. The aluminum channel is 27". I'm guessing it is part number is
27" Series 385 Channel Balance
Product Code: S385-27 Option 2630?

Thanks

Trent
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Casey from SWISCO responded:

Hello,

With this combination of attachments, you could have either an S380-27 or S385-27 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. You'll also need 2630 spring strength options for your replacement balances.

to weigh your sash to determine which option you'll need. There is a chart on the product page that explains how to choose your option based on the sash weight.

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.
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