Window channel balance

A home owner from SC says:
We are in need of replacing a set of channel balances On what we think are Patriot Windows, but unsure. The balance has the following details stamped on the metal 30C RC BSI.

Can you help?
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Bob from SWISCO responded:

I believe this might be an S770-30 Channel Balance. Look over all its specifications and let me know what you think. 

How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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