How to ID Channel Balances

A quick learner from Dunnellon,FL says:
Don't know which balances I need. There are numbers on each one. I have some with a number of 1820, some with #3010 and ones with #2830 on the metal itself. How do I order them? Can these #'s determine what I need? I have an older house and I don't know the make of these windows. Please help! Thank you!!
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Bob from SWISCO responded:

Thanks for posting. While the stamped numbers are important, they only tell us the strength of the spring inside each particular channel balance. The size and style of the channel balance and its end attachments are what matters most in identifying a replacement. If you could provide pictures of the end attachments, as well as measure the length of each metal channel (not including the end attachments), then we can help you find your new balances. See the video below for details. 

How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
VIDEO
WATCH >
How to replace a channel balance
How to replace a channel balance
GUIDE
READ >
How to replace a non-tilt channel balance
How to replace a non-tilt channel balance
GUIDE
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Choosing a Non-tilt Channel Balance: What Will We Need?
Choosing a Non-tilt Channel Balance: What Will We Need?
GUIDE
READ >
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