36 inch window channel balance and it is 1/2 inch

A quick learner from Temple Terrace says:
I don't see these 3640 listed on your options to pick from.
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Bob from SWISCO responded:

Thanks for posting. The stamp on your Channel Balance does not indicate the kind of balance it is, or even necessarily its length; rather this indicates the strength of the spring within the balance needed to support your window sash. We can help you identify your balance, but we will need to see it removed from the window, with pictures of both end attachments. You should also confirm the length of the metal channel, not including the end attachments; likely this is 37", but its best to check to be safe. If you need help removing the balance from your window, see the video below. 

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