Have I stripped out my spiral balance?

A home owner from Mandeville, La says:
Hello, My name is Greg. I purchased a couple 41" green tipped 3/8" spiral window balances from you about 2 years or so ago. I just now decided to change them on the window. I replaced the balance and the shoes. I got the window to hold it's position when it was raised all of the way. It would not hold itself up if only opened 6 or 8 inches.

I used the tool and attempted to tighten both sides up another 2 or 3 turns. This probably would have been about 30 or 35 turns total on each side. The balanced striped out. It unwound and would not stay if you turned it more than 6 or 8 turns.

I am assuming that they were wound to tight. My question is should I go up to the black tip or change to the other size spiral balance? I am not sure if there is enough room for the larger diameter balance. I am not sure of the weight of the window but it is about 42" X 45". Your advice would be appreciated.
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Paul from SWISCO responded:
Unfortunately, whoever designed a window this large to accept 3/8" tube balance did so incorrectly. You did strip the balance by too many turns.

All is not lost, however. Please send some photos of your window, track and shoe and I will try to help.

In the meantime, take a look at our 5/8" Series 600 spiral balances and see if you think you can replace the thin balance with one of them.
A quick learner from louisiana says:
It looks like it will be close but I think that the larger size will fit. Is the 2 options to either go to a stronger 3/8" or change to 5/8"? Is the green the strongest 3/8"? I also replaced ordered new shoes when I ordered the other balances. It was the Product Code: 15-121 that I used.

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Paul from SWISCO responded:
Check the thickness of old pivot shoe and compare it to our 1/2" thick 15-046 and our 9/16" thick 15-121.

In using the 3/8" balance, the green tip is stronger. If you were to go for the 5/8" Series 600, I would go with black tip.
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