twin balances

A professional from 21811 says:
November 17, 2020
these are from a older window and the manufacturer is. They are attached together on each side. No markings except patent#. they are 1" wide 1 1\4 length at the receiver end the spring is 12 1\2 long spring and approximately 25" total length.
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Bob from SWISCO responded:
November 19, 2020

Hello there. These old rod balances aren't made anymore, but you can replace it with our Series 770 Channel Balance. If the rod is 25" long, use the S770-25. You'll need to obtain the exact weight of the window sash to determine the stamp option needed. let me know if you have further questions.
25" Series 770 Balance
25" Series 770 Balance
S770-25
$12.59
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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