Coil balances collapsed

A quick learner from United States says:
April 26, 2018
These were purchased in 2016 and are now collapsing. These are custom windows. We are sure that the sash weight is correct for this balance. Is there a reason to believe another balance may hold up better?
Thumbnail of the uploaded file named 13042631181.jpg
Thumbnail of the uploaded file named 13042631182.jpg
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Paul from SWISCO responded:
April 30, 2018

Hmm...I am not really too sure. These Series 140-11 Quick-Tilt coil balance systems have been fairly reliable. Something could have happened, like tilting the sash or forcing the window to travel under stress. Being custom windows, the manufacturer has designed the windows to use Series 140 balance system. I would stay with the Series 140.
11 lb Series 140 Quick-Tilt, Dual
11 lb Series 140 Quick-Tilt, Dual
S140-11
$11.45
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