Stamp option on balance

A home owner from Missoula,Mt says:
My balance does not have a stamp that matches. Which one should i choose for my balance order? Thank you!
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Tom from SWISCO responded:
Good question. The best way to determine the proper stamp option for your channel balance is to weigh your window sash. Depending on the window sash, you will consult the chart on the S385-15 web page, and you will select the stamp option that matches the weight of your sash. Let us know if you need more help.
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