Alenco channel balance

A quick learner from Shreveport, LA says:
My home was built in the early 1980's with 20 Alenco windows of different sizes & shapes. All have problems with the channel balances.

My first repair project is missing a channel balance. The remaining one does not have any block & tackle.
28" length,
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Hey, thanks for posting. I've narrowed this down to two possible channel balance Series: either our Series 351 or our Series 390 balances.

Now, as you can see, there is only one difference between these two Series, and that is their bottom shoe. The Series 351 uses the 15-002 while the Series 390 uses the 15-001. I can't quite tell what you have based on your pictures, though. Please carefully compare their dimensions to your own hardware and see which is a better match.
Comparison of <a href='Channel-Balance-Shoe/pd/Replacement-Sash-Support-Channel-Balance-Shoes/15-001'>15-001</a> & 15-002
A handy person from Shreveport, LA says:
Dear Tom:

Thanks so much. I took the measurements & the 15-001 shoe fits.

I just placed an order for the first batch of replacement channel balances.

2 windows down, 18 to go.

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