Tom from SWISCO responded:
November 8, 2016
Thanks for posting! I have received your image, and I believe we can help. I'm thinking our S770-38 channel balance, but with a special 38F stamp for your extra heavy sash. This will have to be custom made. I will send you a special link that you can use to add two of these your cart. Let me know if you'd like to make any changes.
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