Tilt window balance with white vinyl cover

A quick learner from USA says:
December 30, 2016
Mine must be closer to 3/8. I am attaching a few pictures that might help in determining the best fit. I tried to get a picture of the outer diameter and the diameter of the spring. I am also including a picture of the tip. The cover is made of a thin plastic tube. Thank you so much for all of you help.
User submitted photos of a window balance.
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Paul from SWISCO responded:
January 6, 2017
Looks like the outer diameter of your white tube is 3/8". Can you confirm? If so, I recommend our Series 900 spiral balance.
A handy person from Florida says:
January 11, 2017
Yes, the outside diameter is 3\8" . I was just concerned about the different materials in the tube. Why is mine a white plastic material and I have not been able to find anything like that?
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Tom from SWISCO responded:
January 18, 2017
It's just an older version. I don't think many manufacturers make these balances with plastic tubes anymore due to how easily they break. They get very brittle due to sun exposure, and in many cases end up cracking and falling apart long before the spring itself actually wears out. This is not a concern with modern metal-tubed balances.
Spiral Balance Charging Tool for Tilt Windows
Spiral Balance Charging Tool for Tilt Windows
75-006
$9.97
12" Series 900 Spiral Balance
12" Series 900 Spiral Balance
S900-12
$7.70
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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