Need to find replacement piece for Side-Load Single Hung Balance Spring

A landlord from California says:
April 1, 2013
I need to replace my Side-Load Single Hung Balance Spring because the string broke. As shown in the picture it measures 22" and the metal piece is 10/16" wide. 20-4 CA2 CMC 7 is written on the left balance spring. The aluminum window frame had a logo that looked like a "MM" or "WW"
User submitted photos of a window balance.
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Tom from SWISCO responded:
April 2, 2013
Thanks for posting! Before I can offer an applicable replacement for this channel balance , I just need to know a bit more information about the bottom attachment. Please take a look at our 15-004 and 15-005 channel balance shoes, and note their depths. As you can see, they are 1-3/32" deep and 1" deep, respectively. Which one more closely matches your own bottom attachment?
A landlord from CA says:
April 2, 2013
it is 1-3/32" deep
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Tom from SWISCO responded:
April 3, 2013
Great. If that's the case, then check out our Series 385 channel balance. You said that yours is 22", but I think you should double check that length. Usually balances with a stamp like 20-4 have a metal channel length of 21".
A landlord from CA says:
April 3, 2013
Thanks for your help - you're right, the metal piece measures 21". I just have one final question - I am unsure of which stamp option to choose, can you please help me with that?
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Tom from SWISCO responded:
April 3, 2013
Certainly! Usually a stamp like 20-4 corresponds to our 2040 option. However, you may want to weigh your window sash and make sure it falls under the weight rating shown for the 2040 just in case.
A home owner from California says:
July 12, 2023
When measuring the balance spring, do you measure from medal to medel? There's a 26 stamped on the balance spring, is the length? .
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Tom from SWISCO responded:
July 13, 2023

Yes, when measuring the length of a channel balance you only measure the metal channel. You do not include the nylon fittings.

If your stamp starts with a "26" then odds are it's 27" long. The best way to verify this is to measure it. You never want to guess or estimate when it comes to balances, trust me.

Winged Channel Balance Shoe, 1-3/32" Depth
Winged Channel Balance Shoe, 1-3/32" Depth
15-004
$0.74
Winged Channel Balance Shoe, 1" Depth
Winged Channel Balance Shoe, 1" Depth
15-005
$0.74
How to Replace a Channel Balance Attachment
How to Replace a Channel Balance Attachment
VIDEO
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