1/2"X 1/2" x22" Window slider spring

A home owner from Hayward, CA says:
Window slider spring for raising and lowering window. I do not have any identifying part numbers. Window slider spring goes on inside channel of window. Measures:1/2" x 1/2" x22" in length.
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Tom from SWISCO responded:
I've received your pictures, but I'm having trouble making out what you have. Can you show me a clear and close up picture of the nylon caps on either end, as well as the metal clip at the end of the spring? Finally, is there a stamp printed on the balance? If not, we will need to know the weight of the sash.
A contractor from castro valley,ca. says:
i found out the name of the item i am looking for- it is a "block and tackle side load window balance". it is 22" x 1/2" x1/2". i will try to take better pictures .
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Tom from SWISCO responded:
Thank you. Let us know whenever you can.
A contractor from Castro valley, ca. says:
Here are the pictures you requested. Pete
Channel balance
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Tom from SWISCO responded:
Thanks. I believe you have either our Series 351 or Series 390 depending on the size of the bottom shoe. I can't tell from your pictures what the bottom shoe size is, but that's the only difference between the two balances I mentioned.
How to Replace a Channel Balance Attachment
How to Replace a Channel Balance Attachment
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Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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