Coil spring help

A handy person from Cape Coral, Florida says:
April 16, 2021

I have a 12LB double coil pack currently on our windows. Your website does not show a double pack for the 12LB, only the single (S210). Can I get the 12LB in a double or is there another solution to this particular situation. The building I maintain has hundreds of these windows and our company has only just started ordering parts from your company for them. I am with VOA/Gulf Coast Village. Any suggestions is appreciated, thank you. 

Rob

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Emily from SWISCO responded:
April 21, 2021

Hi, Rob. Could you tell us your sash weight? From there we can tell you which combination of coils to use to support your window. 
12 lbs Series 210 Roller-Tilt .880, Single
12 lbs Series 210 Roller-Tilt .880, Single
S210-12
$8.97
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