verify balance size and weight

A handy person from Mount Vernon WA says:
need expert to help with option
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Tom from SWISCO responded:
Thanks for posting. Is there a stamp printed on the surface on your channel? If so, what does it read? Also, have you weight your sash? You can see the weight ranges for each option available for the S380-27 on that product page. You can simply weigh your sash and see which range it falls under.
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