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Casey from SWISCO responded:
October 22, 2020
Hello, thanks for posting! It looks like you will need our Series 600 Spiral Balance with a red tip. When determining the length, you will want to measure only the outer tube. We do recommend replacing both at the same time, as pairing a new and an old one can cause the new one to wear out more quickly. |
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Bob from SWISCO responded:
October 23, 2020
If the window is non-tilt, then the Series 600 would not be correct. Let's start from the beginning. To obtain the balance length, just measure the outer tube, up to and not including the colored tip. If it's indeed 30", then yes, you have a 30" long balance. The diameter of that outer tube should be either 5/8" or 3/8". Finally, is there any bracket shoe or attachment that the spiral rod connects to? |
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Casey from SWISCO responded:
October 26, 2020
May we please see a picture of the top of your bottom window sash? Also, take a look at the picture below. It shows the end of the S600, which looks very similar to yours. 
Close up view of the S600 balance bottom.
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