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how to determine sash weight

A quick learner from colorado springs says:
One of our channel balances' sash cord broke. There is no ID on windows or sash balance. I'm trying to order the right balances. Window is Non-Tilting double hung vinyl 48" x 72". Please recommend sash weight? I think I need S385-26 with 15-004 shoe & 19-005 top attached. Thank you for your informative web site. Builder data said these are Viking vinyl windows but there is no info on them except "series 400, H-R35 - 48x72" "UM111" "AAMA/NWWDA 101/1.S.2-97"
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Paul from SWISCO responded:
Thanks for posting! With no stamp on the balance itself, you will need to weigh your sash to determine the proper strength option. There is a chart on the S385-26 store page that lets you know what what option can support what weight. As for what Series you need, I can't be sure. The best way to determine that is to confirm that the 19-005 and 15-004 are exactly the same as your current attachments.
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