Identify Window Channel Balance

Quick Learner from Winnebago, IL
Metal frame is 1/2" x 28"
Code stamped on metal frame is 2730

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Bob
Bob from SWISCO
SWISCO
Expert

Thanks for writing in. It appears you have either the S351-28 or S390-28. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below for reference. Compare both with your old hardware to see what matches best. In either case for a new stamp option choose 2730.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

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