Will my new S900-32 replace my older, larger balance?

A handy person from Eustis FL says:
October 25, 2011
I received my order of an S900-32 Spiral Balance. The diamter is smaller than my old one
New one is .383 old one is .426 would close to 1/2 inch can I use the new one with old one
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Mike from SWISCO responded:
October 26, 2011
Have you tried the 900 Series in your window? Does it work?

I believe your original balance may have a white plastic cover on it, which is why the diameter is measuring a bit larger than the 900 Series, but smaller than the 600 Series.
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