Replacement window balance

A quick learner from Milgard window says:
October 16, 2016
Im trying to determine the correct replacement part for a window balance installed in a Milgard Window.
The stamp on the current balance is " 26 4 JO Caldwell"
Channel Balance
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Tom from SWISCO responded:
October 19, 2016
Start with our S385-27 channel balance, this looks like it matches what you have.
A quick learner from Brentwood says:
October 19, 2016
Is the item returnable if it doesnt fit? Is there a second option that might be close also?
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Tom from SWISCO responded:
October 21, 2016
Yep, they are returnable. See our return policy. Another option that may be close is our S380-27, but based on the size of your bottom shoe in your final picture I don't think this is it. We list detailed information for all of our hardware that you can go over to confirm if our suggestions will wo rk.
A quick learner says:
October 21, 2016
How do i know what "option" to purchase alongside S385-27?
The markings are " 26 4 JO Caldwell"
A quick learner from brentwood, ca says:
October 25, 2016
How do i know which "option" to buy? The stamp says "26 4 JO" so does that mean option 2640?
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Tom from SWISCO responded:
October 28, 2016
Yes, a stamp of 26 4 usually corresponds to our 2640 option. You can always weigh your sash to confirm, as well.
27" Series 385 Channel Balance
27" Series 385 Channel Balance
S385-27
$10.55
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