Jasmine from SWISCO responded:
April 8, 2024
Thanks for reaching out! Your channel balance appears to be the S350-31 with a wingless top and a winged bottom shoe. Although, you want to confirm that you shoe depth is 1-3/32". Let me know if it differs. Since your balance is stamped with a 30C, you should be able to use the 3030 stamp option which can support a sash weighing 16 to 23lbs. Close up view of the S350 balance shoe.
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