window springs

A quick learner says:
These are the springs for a tilt out double pane window I have in Florida. the marking on the units ar dD27 they are a plain channel
User submitted photos of a window balance.
A handy person from leesburg fl 34748 says:
units ar dD27 they are a plain channel

TYPO D27 NOT dD27
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Paul from SWISCO responded:
Take a look at our Series 770 channel balance, I think this may be what you need.
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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