balance ID for wood window

A quick learner from Langhorne, PA says:
this part came from a 35 x 26" wooden sash window. It appears that it attached at the bottom of the sash. Length of the spring on the balance is 15 11/16". Total length (all the way out - from the nail that attaches it to the frame to the pivot point on the spiral) is 54 1/8". Need replacement balance. Can you ID?
A customer submitted photo of a spiral balance.
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Tom from SWISCO responded:
Thank you for contacting us. Before I can offer an applicable replacement for this spiral balance, I just need to know a bit more information. First, is your window tilt, or non-tilt? Next, what is the weight of your window sash? You can determine this by removing it from the window and placing it on a scale.

Finally, I'll need to know the length and diameter of your balance tube. I see that yours is fairly damaged, and it will likely be difficult to get these two dimensions. How does the other balance in the window look? Would it be easier to get the tube's length and diameter from the other? Let me know!
A quick learner from Langhorne, PA says:
The other balance is just as bad if not worse. The spring is around a tube which is 3/8"diam.and the spring was covered by the deteriorated silver plastic cover. The tube (as much of it as I can see)is 11 and 5/8" which then goes into the spring. I am about 60 miles from the window itself at this time, but the lower sash was very light when I moved it, I would venture to say it was less then 5 or 6 pounds and the window is non tilt.
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Paul from SWISCO responded:
Thank you for that information. I think I have a suggestion for you.

Please take a look at our Series 500 spiral balance. I believe that this may be the replacement you're looking for, but compare it to your own hardware just in case. Keep in mind that the length of our tubes end on the inch. You should double check the length of your tube (as best as you can with its damage, anyway) to see if it could match up to any of our standard options. Let us know what you think!

You would also want to use the 17-012 bracket with this balance.
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