Spring for Alwintite window

A quick learner from 60062 says:

The house was built in 1954 and a brand name on the window says "C-Alwintite". One picture shows a spring which I cut to remove it, so a square shaped metal plug attached to the spiral that wedged into the bottom of the sash. It was near impossible to re-insert the plug once it came out the bottom (at least with the sash still installed).

The spring measures 25.5 inches long and the spiral insert is about the same length. When the window is opened the spring will rotate. You can see at the top of the spring that at one time there was a thin tube that covered the spring when the window was closed. That tube was very brittle and has cracked off on every window but one in the house. The spring is 7/16ths in diameter. The channel in the frame has no tabs or latches except a screw hole at the top.

The underside of the sash is covered with a flexible layer (thin aluminum?) that looks like it is held in place by tension only and could be popped out.

I've tried to raise the sash and push it to one side to see if it will come out. Some times I can get part of the window clear of the channel but it would take some force to pry the window all the way out. Any idea how to remove the sash and/or hook up a new spring?

Thank You in advance.

- Paul
User submitted photos of window hardware.
A home owner from Northbrook IL says:
Hello again,

Here is some additional Information for this post.

I removed a spring from the other side to see the bottom fitting. See Photo.

The length of the spring when the spiral is fully wound inside is 27.25 inches (from the attachment hole on top to the lowest part of the spring). The window fully open would stretch this to 51.5 inches I can't weigh the window, but the storm window of the same size weighs about 10 lbs. Sash size is 27x39.

Thanks again.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Hello! Thank you for posting. For your balance, I would recommend our S500-27 spiral balance with a R Red Tip. I would also recommend our 17-012 bracket. Review this hardware and let me know if you agree. Installing them will be tricky, however.

Your sashes actually aren't made to come out unless you dismantle the main window frame, which is a time consuming job. When I used to repair these balances, I would remove the old balance and shoe and while the sash was closed. To install the new balance, I would drop it in behind the sash and screw it in at the top. Then, with someone's help, I would raise and hold the sash up and pull three or four inches of the rubber weatherstrip from the bottom end to allow me to install the 17-012 bracket. I recommend doing this with our 33-085 (or similar) screws.

When that's done, I would charge the balance with our 75-004 or 75-005 tool by turning it three or four times, clockwise. I would then lock the balance between the fork of the 17-012 and repeat this process for the other side.

Once it's all done, try the sash. If it creeps down, give it another turn or two. Work the bottom rubber weather strip back in its groove and you're done!
A home owner from Northbrook IL says:
Thanks for your reply. I will follow your advice.

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