Channel balance

A handy person from Pierre south Dakota says:
My channel balance broke and I found all the info on your web site except for the number stamped on the side.
It is a 23" series 350 channel balance with a 2290 bsi tg 24 stamped on the side so I do not know wich spring tension to order.
Thanks for your assistance Bill
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Tom from SWISCO responded:
I'm afraid the stamp you have, "2290," uses an old number rating that has fallen out of use. The good news is, one of the standard options for the S350-23 may still work, but you will have to weigh your sash and refer to the chart on the S350-23 store page to confirm which is best.
A handy person from Pierre ad says:
Thanks for your help
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