phillips window balance

A quick learner from Oregon says:
March 7, 2015
length over all 21", length of steel 20", only mark 19 2 DQ CALDWELL. This one broke. Do I nees to replace one or both?
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
March 11, 2015
Thanks for posting. We usually recommend placing both. As balances get older the spring's resilience wears out. If you just replace one, the newer balance has to work extra hard since the old spring wouldn't be as strong. Replacing both ensures that they each have an equal load. Plus, you can always save the old working balance in case of emergency repairs.

Based on your photos, I would recommend our S385-20 channel balance. I would also recommend our 1920 option. Review this part and see if you agree.
20" Series 385 Channel Balance
20" Series 385 Channel Balance
S385-20
$9.38
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