Spiral Window Balance - plastic

A home owner from Cape Coral, FL says:
i purchased 307 but the metal version was not supporting the window weight and it would crash everytime. Very similar product.
Unfortunately there is no labeling on this balance.
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Bob from SWISCO responded:

Thanks for posting. Sorry to hear that the Series 307 didn't work for you. You can see our Return Policy here. It looks like you need balances for a tilt window, whereas the Series 307 is for non-tilt windows. It's a bit difficult to read measurements from pictures, but see if your balance's outer tube is 3/8" in diameter and 30" long. If so, you need our S900-30. You will need to obtain the exact weight of your window sash to determine what color tip option you need. Let me know if you have any other questions.

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