windows that won't stay up

A home owner from Castle Rock, CO 80104 says:

Hello, I have an 18 year old, custom built home, with windows that are not identified with a manufacturer name or number. Two of my south facing windows won't stay up. If opened to any height, within a few minutes they slowly slide back down to the bottom. No parts appear to be broken unless it's something I can't see. The bottom halves of the windows (i.e. the halves which slide up and down) are ~ 33" wide by 29" tall. There appears to be a roll-up spring strip anchored to the track for those windows (image 0190 & 0191) with a metal strip running along the inside of the track which then anchor to a bottom shoe designed to hold the window. The windows seem pretty sturdy and heavy so maybe the spring mechanism just can't hold them up any longer. Is this something you can help me with and do you have the parts to fix my problem? I have two side-by-side windows with the same problem. Thanks, Jim

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Tom from SWISCO responded:

Hello! If your window won't stay up anymore, then odds are the issue is the balance. These are the spring assemblies you see on either side of your frame. They lose tension over the years from frequent use and just plain old age. 

The good news is that yours are pretty common and simple to replace. You have a specific kind of assembly that uses the Series 190 spring. You'll need to get the stamp printed on your old springs to confirm the best option to go with, but I'm confident that this will work for you.

The videos below may also be of some help.

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