Channel balance

A quick learner from California says:
October 8, 2023
Hello, I'm looking for the original channel balance for my vertical lift bathroom window.
The channel length is 27"
Channel depth is 5/8"
The part has an ID stamp that shows 2640

Thanks

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Bob from SWISCO responded:
October 8, 2023

Thanks for posting. It appears you have either our S351-27 or S390-27. The only difference between these two channel balances is the depth of the bottom nylon shoe. See the diagram below for reference. Measure your old shoe's depth to see what matches best. In either case for a new stamp option go with 2640.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
27" Series 351 Channel Balance
27" Series 351 Channel Balance
S351-27
$10.77
27" Series 390 Channel Balance
27" Series 390 Channel Balance
S390-27
$10.55
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