Paul from SWISCO responded:
November 28, 2017
I believe your Alcoa tilt window uses S600-30 spiral balances. Please note: our balance tubes are metal, not plastic like yours, to stand up to UV sunlight. The colored tip (indicating the strength of the balance) for your 19 pound sash will be blue. You might also want to purchase a 75-006 charging tool to make for an easier replacement job. Review our videos on the right for more help, as well.
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