Lawson window replacement of channel balance.

A handy person from cudjoe key , FL says:
Part # on back of Lawson balance is 2920, what is Swisco replacement # ??
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Tom from SWISCO responded:
I'm not sure! All that stamp tells us is how strong the spring is. I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have.
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