3CG Balance Replacement

A quick learner from Miami, FL says:
March 21, 2021
Hello. I am trying to find the right replacement for this. The balance is for a non-tilting window. It measures 31" length x 1/2" width. It appears to have "3CG" etched on the balance. Please let me know if there is anything else needed to help identify this. Thank you!
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Casey from SWISCO responded:
March 23, 2021

Hello,

It looks like you have either our S351-31, with a 15-002 bottom attachment, or S390-31, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a 3020 spring strength option for your replacement balances based on the stamp, which appears to be (30 B). Thank you!



Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
31" Series 351 Channel Balance
31" Series 351 Channel Balance
S351-31
$11.52
31" Series 390 Channel Balance
31" Series 390 Channel Balance
S390-31
$11.30
How to Replace a Non-Tilt Channel Balance
How to Replace a Non-Tilt Channel Balance
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How to Repair a Jammed Window
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How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
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How to replace a non-tilt channel balance
How to replace a non-tilt channel balance
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Choosing a Non-tilt Channel Balance: What Will We Need?
Choosing a Non-tilt Channel Balance: What Will We Need?
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