spiral spring balancer

A quick learner from Murrells Inlet SC says:
June 4, 2021
Kindly explain why my MI aluminum single sash double pane windows have both plastic and metal spiral spring balancer tubes?
Should I be concerned whether or not to replace with ike tubes?
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Casey from SWISCO responded:
June 8, 2021

Hello,

The plastic tubes are an older style that deteriorates over time, which is why the manufacturers switched to metal tubes. The length and diameter of the tube are key to determine which replacement you need. Thank you!
29" Series 900 Spiral Balance
29" Series 900 Spiral Balance
S900-29
$9.15
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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How to Identify a Replacement Spiral Balance
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