spiral balance for 40 pound sash

A contractor from Florida says:
February 14, 2018
What spiral balance would I need for a 40-45 lb. sash non tilt impact glass and is there a special tool for adding tension?
See attached pic.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
February 16, 2018
Thanks for your questions. I believe our S600 spiral balance appears to be the best match for you. The tube looks like it is 30" long. You should be able to go with our black colored tip for the balance which holds a sash weight of 31-40 pounds. We highly recommend you weighing your sash to get the "exact" number of your sash to confirm this is the correct color option for you.
30" Series 600 Spiral Tilt Window Balance
30" Series 600 Spiral Tilt Window Balance
S600-30
$9.40
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How to replace a tilt window spiral balance.
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