Help identify 21A, 21B, and 3020 channel balances

A quick learner from United States says:

Hello,

Not sure of proper length/series for the attached balancers. Marking on first pair is 21A, 21B. Looks like Series 800 Channel Balance. The second pair of balancers is marked 3020. The metal part of the balancer excluding the plastic foot and top parts measures 31".

Thank you for your help.

Carol

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Tom from SWISCO responded:

Thanks for posting, Carol. I received your pictures, but I'm afraid they're too small for us to make out specifically what you have. I can tell you that I don't think the Series 800 is what you have. This is a very skinny balance at only 3/8" wide. Your balance looks more like our 1/2" wide variety. I'd confirm just to be sure.

We can still help you identify the Series, but I would like one clear picture of the top nylon attachment and one clear picture of the bottom nylon attachment. That will be a huge help. Thank you!

A quick learner from USA says:

Attached are the additional photos you requested of the top and foot pieces of the balancers.

Again thank you so much for your help!

User submitted photos of a window balance.

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Tom from SWISCO responded:

Thank you! These are perfect. Start by looking at our Series 380 channel balance. This comes with a 19-005 top and 15-005 bottom, so as long as those match up to your nylon ends it should work great as a replacement.

A quick learner from San Francisco, CA says:

Hello Tom!

I think the correct balancers we need have been identified. I will be placing an order shortly.

Thanks again for all you help!

Carol L.

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