Casey from SWISCO responded:
December 19, 2017
Hello Tom. It sounds like you are on the right path. Based on your stamped number of "28-0-40" it may correspond to the 2840 stamped option. To be 100% certain on which stamped option to choose, you would weigh your window sash on a scale. From there, you would refer to our sash weigh range chart, and correspond that number to the appropriate stamped option. I hope this has answered your question.
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