What balance option for my S751-17?

A home owner from USA says:
Need help choosing an option for S751-17. Present balance that is to be replaced is marked 16D. Window sash is wood with double pane glass.

Thank you for your attention,
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Tom from SWISCO responded:
Thanks for posting. I recommend that you weigh your window sash and compare it to the options available for the S751-17:

16HD: Two balances with this option can carry a window sash weight of 17 through 22 pounds.
16R: This option can carry 10 through 17 pounds.
16TG: Finally, this option can carry 22 through 24 pounds.
A contractor from Massachusetts says:
It will require 16HD as it weighs 17.5 pounds.


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