Spring balances

A handy person from Gig Harbor Wa says:
February 19, 2022

I have two sets of these old windows. They had the old spring balances. I would like to replace them. Only the lower sash move. The sashes weigh 7lb. I measure the glass area at 23.5". Could you let me know what sizes I need to order

Thanks

Nita

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Tom from SWISCO responded:
February 22, 2022

These balances haven't been made in a long, long time, which I'm sure you've already guessed. The good news is that we find that our Series 500 spiral balance, along with our 17-012 bottom bracket (sold separately) work perfectly well as replacements. We've been using these to repair wood windows like yours for years. 

As for size, I think 24" will work perfectly fine. 
Bracket, #32
Bracket, #32
17-012
$1.20
24" Series 500 Spiral Balance
24" Series 500 Spiral Balance
S500-24
$9.02
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