spiral balances cant keep window up

A home owner from Fair Lawn NJ says:

My window does not stop. It is old SilverLine window, lower slash 29" length x 18" high

I measured balance: 17" by 5/8", what parts do you recommend me to buy. I did not find on internet any description, drawing or clip, which will be closed to my situation, but I am sure, you understand it completely

with parts I'd like to have installation description

I will very appreciate your help, Sincerely, Viktor
A customer submitted photo of a spiral balance and shoe.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting, Viktor! If your window can't stay up, I would charge your spiral a few times before you try replacing the whole thing altogether. It may just need to be tightened up.

To see how to charge your balance, take a look at our tutorial video on how to replace a tilt window spiral balance:
A home owner from Fair Lawn says:
Thank you Paul,
I will do it, but I think that spiral was broken because the window is very old
Thank you very much for the fast and understandable reply
If spiral is broken I will need to know what part to order
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)
Current wait time is 4-7 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at 856-317-6263 or at help@swisco.com.