Broken coil spring

A home owner says:
December 20, 2023
If only the coil is broken, may I just change the coil? if yes, how to change if I order a pair of coils? Thanks.
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Emily from SWISCO responded:
December 26, 2023

Thanks for reaching out to us. Yes, you can replace just the coil spring though we recommend you replace both sides at the same time. You wouldn't want to mix and match old springs with new ones. 

We'd be happy to help identify the proper springs but we'll need to see photos of the pivot shoe first, preferably removed from the window track. 
A home owner says:
December 26, 2023
This is the good side one, M 9 LB. The sash is about 18 lbs.
So the 9 lbs Series 180 Coil Balance should be good, right?
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Emily from SWISCO responded:
December 27, 2023

Thank you for the additional photo! This looks like our S161-09 balance assembly. A pair of these will support a sash weighing 18 pounds. Just note that they're sold individually. 

Alternate image for S161-09
Alternate image for S161-09
9 lbs Series 161 Roller-Tilt
9 lbs Series 161 Roller-Tilt
S161-09
$6.97
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