35C BSI balance

A handy person from Okatie, SC 29909 says:
Need 2 balance for Capitol/MI window
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Bob from SWISCO responded:

This appears to be an S770-35 Channel Balance to me; see if you agree. You'd want a stamp option of 35C. 

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