single hung window channel balance

A quick learner from Arizona says:
February 22, 2024
the bottom is broken and I cannot get the other side removed. Only marking I can find on it is 2040, it's for a single hung window and the existing channel is 21" long. Can you identify the replacement I would need from this description and the pictures? Thank you!
Thumbnail of the uploaded file named 2040 Balance Stamp
Thumbnail of the uploaded file named Balance Top Guide
Thumbnail of the uploaded file named Wingless Balance Shoe
Thumbnail of the uploaded file named Wingless Top Guide
Thumbnail of the uploaded file named Channel balance Shoe
Profile picture of Jasmine
Jasmine from SWISCO responded:
February 23, 2024

Hello,

Thanks for posting! Your channel balances look a lot like either the S351-21 with a 1" shoe or the S390-21 with a 1-1/8" Shoe. To determine which of these is the right replacement, carefully compare the measurement from the depth of your bottom shoe.

You'll need to select the 2040 stamp option.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
21" Series 351 Channel Balance
21" Series 351 Channel Balance
S351-21
$9.59
21" Series 390 Channel Balance
21" Series 390 Channel Balance
S390-21
$9.38
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