Spiral balance identification

A quick learner from Fort Worth, TX says:
I need to replace a defective spiral balance that is 3/8" diameter and 29" long that looks like the series 306. Your site asks for the color of the tip for the replacement. Mine does not have a colored tip. It does have a clip like the series 306 but I do not know the difference so I can order the correct part.
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Dave Sr. from SWISCO responded:
The color of the tip determines how strong the spring is. With that in mind, we can determine what you need based on the weight of your sash. If you can remove your sash and place it on a scale, then tell us what you get, we can recommend a replacement option.
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