spiral spring selection

A handy person from Florida says:
April 26, 2016
I need two spiral balances for a window (non tilt) that weighs 40 lbs.

The old spiral is blue tipped, 29" long, and 9/16" in Diameter. What balances should I order.
I sent a question earlier but gave the wrong email.

Thanks Ron
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Tom from SWISCO responded:
April 27, 2016
If you have an S500-24, then the Black Tip color option can support 40 pounds. You may want to double check your sash weight to confirm that your sash weight falls within the 31 to 40 pound range.
A handy person from Florida says:
April 27, 2016
Why a 24" spiral S500-24 when the old one is 29".
Also what is a sash weight? The window itself weighs 40lbs. on a bathroom scale.

Thanks Ron

ps their is no numbers or names on the windows. they are too old.
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Tom from SWISCO responded:
April 28, 2016
I'm sorry, Ron, I was a little confused. You mentioned 29" but you were posting under the S500-24 balance page. I had erroneously assumed you meant to say 24", not 29". That said, the Black Tip for the S500-29 can support the same weight. As long as your sash is exactly 40 pounds, I see no reason why the Black Tip can't work.
A handy person from Florida says:
April 28, 2016
thanks makes more sense. my bad.

ron
24" Series 500 Spiral Balance
24" Series 500 Spiral Balance
S500-24
$9.02
29" Series 500 Spiral Balance
29" Series 500 Spiral Balance
S500-29
$9.57
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