spring sash supports for a wooden double hung window

A quick learner from Dedham Ma. 02026 says:
would like to find a vendor for the above product.
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Tom from SWISCO responded:
We carry a wide range of sash support systems. I'm not sure exactly what you have, though. If you want, you can remove your current balance system from the window and show us a picture of it. That will allow us to determine what you have.
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