Simonton sash spiral balance

A quick learner from Sarasota, Florida says:
Attached are pictures of the sash I need replaced. The sash is in a white plastic sleeve and is flexible. There is an additional nipple (round attachment pin.?) that has rusted off the end of the spiral metal end and is missing from the photo. The window is a fixed window and does not tilt in...I ordered and received 4 sashes that do not fit and I will return...I need 4 of the correct sashes.
User submitted photos of a window balance.
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Tom from SWISCO responded:
Thanks for posting! Actually, these are called balances. The sash is the part of the window that moves up and down. Before I can offer an applicable replacement, I just have a few questions.

What is the length and diameter of the tube for this balance? Could you also tell me the weight of the window sash? That would help us determine what weight rating a replacement balance would need. Let me know!
A quick learner from Longboat Key, FL says:
Balance length is 31 inches and the diameter looks to be 5/8 ths. I have no clue as to the weight of the sash and do not know how to find it...
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Tom from SWISCO responded:
Thank you for the information. It looks like you may have something like our S500-31 spiral balance. Does that look good to you?

You would determine the sash weight by removing your sash from the window and weighing it on a scale. It's important to know, as you need to choose your tip color based on what that weight is.

For the S500-31, the Red Tip can support a window sash weight of 7 through 29 pounds, while the Blue Tip can support 12 through 31.
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