Caldwell Window Balance problem

A quick learner from Dillon, Montana says:
June 22, 2016
I watched your videos and measured my defective balance.

The metal portion is 21" long, 9/16" H, and ~ /9/16" W.
The end that has the hook connected to it has a plastic dimension 1 1/16"

The printed identification says: CALDWELL 20 4 HS.

It looks like it would be a SWISCO 385-21, ...but I don't see a 21" part in your Store.

Do you carry such a balance, or can you suggest where I might get a couple.

Thank you,

Richard
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Tom from SWISCO responded:
June 23, 2016
Hey, Richard. We absolutely carry a 21" Series 385 balance. See our S385-21 and let me know if you have any other questions.
A quick learner from Dillon, Montana says:
June 23, 2016
Tom,

The number printed on the current balance is
20 4 HS.
How do I determine which option to specify from your list of choices?

Thanks again,
Richard
Profile picture of Tom
Tom from SWISCO responded:
June 23, 2016
A stamp of 20 4 usually corresponds to our 2040 option, but you can always weigh your sash on a scale to be 100% sure.
21" Series 385 Channel Balance
21" Series 385 Channel Balance
S385-21
$9.38
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