Window Balance needs to be replaced

A quick learner from Bonita Springs, Florida says:
April 19, 2012
My balance has "28 3 EN CALDWELL" on it.
What is your replacement for that?

Thanks
User submitted picture of channel balance 28 3 EN CALDWELL.
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Paul from SWISCO responded:
April 27, 2012
Thank you for posting, and for the pictures. Before I can offer an applicable substitute for your balance, I just need a bite more information. First, what is the length of your metal channel? Please do not incorporate the plastic attachments in your measurement.

Second, please refer to the following chart and pick out what shoe most closely matches your own. Seeing as how yours doesn't appear to have any wings, you will probably have either a 15-001 or 15-002. Please keep in mind that while a fraction of an inch difference may not seem like much, it is important to the function of your balance.
A SWISCO guide to identifying balance shoes.
A quick learner from Bonita Springs, Florida says:
April 29, 2012
Hi Paul,
My "28 3 DN CALDWELL" has a Bottom End (1 1/16") almost exactly like the 15-001. Maybe the 1/16" missing has worn off?
Also, do you know enough about the Top End from the picture?

Thanks
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Paul from SWISCO responded:
May 1, 2012
Thank you for the information. With this in mind, I think you may want to look at our S390-29 channel balance with a 2830 stamp option. However, please confirm that the length of your metal channel is 29" first. Let me know what you think!
A quick learner from Bonita Springs, Florida says:
January 31, 2013
I finally get to reply - one year later!
Thanks for the info, that is what I will get.
My window weighs 21#. Would I be better off with the 2840 stamp even though it is the next higher weight?
Would 2840 make the window lift easier?

Thanks
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Paul from SWISCO responded:
January 31, 2013
Thanks for posting! Good to hear from you again.

No, I recommend the 2830 option for a window that's 21 pounds. The window will not operate better with a stronger spring--in fact, it will be harder to close, and could cause damage to the sash itself.
A quick learner from Bonita Springs, Florida says:
January 31, 2013
Thanks, Paul!
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Paul from SWISCO responded:
February 1, 2013
No problem! Let me know if you have any other questions.
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