Spiral Balances

A home owner from USA says:
I just purchased a house which is about 34 years old, probably original windows. This is on a small metal non tilt window in the bathroom. The windows do not stay up at all. I measured the return at 23" with a 3/8 diameter. I don't see any color at the bottom. It also has a clip that goes up the side of the window sash. They look very much like you S306-23 returns. Do these need to be adjusted when the tension tool when replacing
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
I agree, this looks a lot like our S306-23. You will have to charge the balance during installation, yes. See the guide below for some tips on how to do this.
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