Channel Balance 30S35

A contractor says:
I am trying to find two replacement channel balances for a non tilt out windows. The stamp reads 30S35.
User submitted photos of their 30S35 channel balance.
Profile picture of Donna
Donna from SWISCO responded:

This is a SWISCO Series 390 balance.

Please check on the length of the balance, exclude fittings for this measure, I believe it may measure 31".

Next, we need the weight of the window sash. Please remove the window sash and place it on a scale to get us the weight in pounds.
A contractor from Robins AFB says:
You were correct, it was 31" and the weight of the window sash was 25 lbs.
Profile picture of Mike
Mike from SWISCO responded:
Thank you.

It seems your replacement will be the S390-31 Channel Balance, with the 3040 stamp.
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