Jordan window balance

A quick learner from USA says:
Hi, I'm having trouble sending my pictures of parts to you. I'm in need of some replacement balances for Jordan windows.
The length is a little over 24 inches end to end. It appears to have a series of pullys inside the channel . I've sent some pictures
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
I think you have either our Series 390 or Series 351 channel balance, but I'm not sure which one. Now, they may appear identical, but they have one key difference: the size of the bottom shoe. The Series 390 comes with the 15-001 and the Series 351 comes with the 15-002. You will need to carefully measure your own shoe and see which is better.

As for the length, only measure the metal channel. That's how all manufacturers determine length.
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How to Replace a Channel Balance Attachment
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