window sash springs

A home owner from Fort Madison, Iowa says:
I am redoing my windows in my 128 year old home. The glass I replaced in the bottom part of the window is substantially heavier and the weights won't hold the window up.

I heard about these springs and want to know if they will work for a 22lb pane.
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Dave Sr. from SWISCO responded:
I have used the 20-001 springs in the past and to my amazement they do work well for this function. I'm surprised that your sash weights won't support the sash. I would first check to see if the cord or chain attached to the weight is not hanging up inside the window casing. There should be a cut-out to access the weights in the side track of the window frame. Also, if need be try to purchase a heavier sash weight. You can sometimes find them at old Hardware stores or at a scrap yard.
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