UNIQUE Balance Spring - RIVCO

A handy person from Groveland MA 01834 says:
This spring balance was removed from one of my many RIVCO brand windows. The house was built in the first half of 2001, here in Groveland, about 25 miles north of Boston. See attached pictures of this UNIQUE 30-C-30 unit with a date code of 25/10/00. I could get by, I guess, with a new "block & tackle", but I am not opposed to a complete replacement unit.

Can you help? See the attached pix, I have several more if needed.
A user submited photo of window channel balance
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Paul from SWISCO responded:
Thanks for posting, and for the pictures! I hope I can help.

Based on the damage of this balance, you may have to get a whole new unit. The pulleys for this hardware are not available separately. Before I can recommend an applicable replacement balance, however, I would first need to see the piece attached to the end of the string. Please send a few more pictures of that piece and I can work from there!
A quick learner from Groveland MA 01834 says:
Thanks, Paul. I am attaching an additional pix of the cord-end.

Regards, - Mike B.
A customer submitted photo of a channel balance attachment.
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Paul from SWISCO responded:
Thanks for getting back to us, Mike! Based on this attachment, I recommend that you take a look at our S770-30 channel balance with a 30C stamp option and see if it matches up with your own hardware.
A quick learner from Groveland MA 01834 says:
Thanks again, Paul.

It looks perfect, but I do not see what it is that changes with the option A, B, C. Since the stamp on my UNIQUE-brand balance has a C in it (30-C-30), is that all I need to worry about? Or do I need to see how C differs from A or B?

Cheers, - Mike Balistreri
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Paul from SWISCO responded:
The stamps indicate the window sash weight that the balance can carry. The 30C stamp can carry 19 through, and including, 24 pounds.

Please keep in mind that the weight range information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
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