Help to identify

A quick learner from Orange county CA says:
October 2, 2015
It's 21" long but the shoes attached top and bottom have wings (see pictures)
User submitted photos of a window balance.
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Paul from SWISCO responded:
October 2, 2015
Start by looking at our S385-21 and S380-21. I believe one of these balances could be what you need, depending on the size of your bottom shoe. Which is closer, based on your own measurements?
A quick learner from Orange county CA says:
October 8, 2015
I've received the 21" Series 385 Channel Balance today, as the stamp shown 20 4 so I chose option 2040 now the tension is too strong, Any idea how to make it lighter.
Thanks
JT
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Tom from SWISCO responded:
October 9, 2015
Sorry to hear you're having trouble. I would also recommend the 2040 option for a 20 4 stamp. I'm surprised it's too strong. Did you ever find your old balance to be too strong?

I'm afraid there's no way to adjust it. You would need a new balance entirely. Before you do anything, though, tell me what the weight of your sash is.
21" Series 380 Channel Balance
21" Series 380 Channel Balance
S380-21
$9.38
21" Series 385 Channel Balance
21" Series 385 Channel Balance
S385-21
$9.38
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