Vinyl replacement window parts

A home owner from Bethesda says:

Hi, our vinyl replacement windows no longer stay open when raised. They are double hung sash windows with top and bottom tilt. The tip beyond the rod is red and the rod measures 18 inches by 9/16 diameter. Thank you for your help!

User submitted photos of a window balance.
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Tom from SWISCO responded:
It definitely sounds like a problem with the balance. If the outer diameter of the balance tube measures 9/16", then I recommend our Series 600 spiral balance.
A home owner from Bethesda says:
Thank you! after I wrote, I found your parts identifier tool and ordered the 600 series balance. It has already arrived and my husband installed it this morning. The window is fixed and we will be ordering parts to repair the remaining windows. Thank you so much! You have saved us thousands of dollars in new replacement windows. I should add that the repair was quick and easy.
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
VIDEO
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How to Identify a Replacement Spiral Balance
How to Identify a Replacement Spiral Balance
VIDEO
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How To Choose the Proper Spiral Balance Tip Color
How To Choose the Proper Spiral Balance Tip Color
GUIDE
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How to adjust a spiral balance on a tilt window
How to adjust a spiral balance on a tilt window
GUIDE
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