Spirals for vinyl windows

A quick learner from Indiana says:
Hey can?t find manufacturers for my vinyl windows but here is a pic and measurements of the spiral for bedroom
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Mike from SWISCO responded:

What are the diameter and length of the tube by itself? If it's 5/8" x 16", choose S600-16.

A quick learner from Indiana says:
The windows are heavier then what you offer under S600-16 I think
I purchased the white before they were not strong enough to hold window up
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Mike from SWISCO responded:

Your old tip was red, so it's to be expected that the white tip wouldn't work. What's the weight of the window sash?

A quick learner from Indiana says:
I do not know how can I find out? I don?t have a scale to weigh it what do you suggest.
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Mike from SWISCO responded:

You would need a scale, I'm afraid. Is there any reason you aren't leaning toward using the same red tip the old balance used?

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