SWISCO - The Replacement Hardware Authority

Can I use a Series 390 for a lighter window?

A quick learner from FLORIDA says:
Does it matter if I use a 390 series balance designed for a heavier window on a lighter window. Also my top sash guide measures 1 9/16" in length. The closest I can find here is the 18-009 1 5/16" the rest of it measures the same. Will this be a adequate replacement? Thank you.
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Paul from SWISCO responded:
The balance Series is determined by the balance fittings, not the strength of the balance. If you can make sure the top guide attachment on your balance matches the one on the Series 390, it should work as a replacement.
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Donna from SWISCO responded:
As for the top sash guide, the 18-009 will work for you if the installation hole placement matches up to your original.
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