Paul from SWISCO responded:
April 19, 2016
Have a friend hold up the sash and use a flash light to look up under the sash. See if there is a fork-like bracket attached to the side of the sash. If so, that's what the balance attaches to. If there isn't anything like that there, consider a bracket like our 17-012. This is installed under the sash with screws.
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