Special weight coil spring?

A quick learner says:
I have a coil spring that I do not see in your catalog. It is your Series 165. The coil sash is marked as a 9.0 and its paten #5232208. Thank you
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Paul from SWISCO responded:
Thanks for posting! Can you confirm what Series balance you have? That patent number you gave is more commonly used for our Series 160 coil spring. This also comes with a 9 pound weight, our S160-9, but our Series 165 does not. If you do have a Series 165, you will need to use a S165-4 and S165-5. These double up to support 9 pounds per side, which will also require a 15-204 double housing.
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