spiral balances cant keep window up

A home owner from Fair Lawn NJ says:
May 6, 2012
Hello

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.
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Paul from SWISCO responded:
May 7, 2012
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:
May 8, 2012
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
Sincerely
Viktor
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