Block & Tackle Spring Assemblies

A home owner from Yorba Linda, CA says:
I was looking at your website and determined that I required 4 ea. Of your S350-34 window sash spring assemblies. I could not determine the option that I need. The assembly that I have does not have any markings that indicate which option I would need. Can you help.

Thank you

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Tom from SWISCO responded:
Hello, Marc. If your balance has no markings, you will need to weigh your sash. We have a chart on the S350-34 store page that you can use as a reference.
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