Tom from SWISCO responded:
October 27, 2015
It's possible the top sash does not use the 24-1033. The top sash and bottom sash do not always weigh the same. Can you confirm what numbers are printed on the original balance boxes that once supported the top sash? That will allow us to find a better match.
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Paul from SWISCO responded:
November 13, 2015
You are correct, the numbers printed on the balance (1031) indicate that our 24-1033 is the right replacement, but the window size tells me you should have the 24-1133 instead. You see this from time to time when manufacturers or contractors install windows. They will be out of the correct balance so they substitute with another. It's almost impossible to know for sure when this happens, unfortunately, but it is uncommon. Did you ever find the windows to droop before with the old 1031 balance?
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