27" 26 4 HV CMC 7

A quick learner says:
27" 26 4 HV CMC 7
Milgard non tilt window
User submitted photos of a window balance.
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Paul from SWISCO responded:
Please see our Series 385 channel balance, I believe this is what you want.
A quick learner from san diego says:
Thanks Paul. What weight should I choose? Not sure how to read the "26 4 HV CMC 7"? Thanks
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Tom from SWISCO responded:
A stamp of 26 4 usually corresponds to our 2640 option, but you can always weigh your sash to confirm.
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