SWISCO - The Replacement Hardware Authority

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

A landlord from California says:
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.
Profile picture of Tom
Tom from SWISCO responded:
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:
it is 1-3/32" deep
Profile picture of Tom
Tom from SWISCO responded:
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:
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?
Profile picture of Tom
Tom from SWISCO responded:
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.
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)