need new balances

A home owner from Atlanta says:
Hello. I need new spiral balances for my tilt windows. My old balances do not have tips. I know that I need 35" long, 3/8 inch wide balances. My windows are vinyl double pane windows that are 22"W x 36" L. I am unable to get one out to weigh it so I'm not sure which tip to order. I could use some assistance. Thanks.

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Tom from SWISCO responded:
Hey, Laura. I'm afraid taking your sash out to weigh is the only reliable method of determining what spring strength you need. Balance manufacturers use the color coded tips as an easy reference to determine what replacement is needed, but without that there is no fall-back. You will need to weigh your sash.
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