Window balance

A quick learner from Troy, Mo. says:
Series 770 Balance 30I BSI

I cannot weigh my widow, but from the internet I think the 30I is for 43-45lbs.
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Tom from SWISCO responded:

Thank you for your patience during this busy season. We can make this balance, though it will have to be a special order. I will email you an order link and price quote right now for 6.

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