broken window balance

A home owner from Augusta,Ga says:
Single hung window with broken balances. Window weighs about 18 lbs. balance is 28" long and approximately 1/2" by 1/2" channel. See attached picture. 2800 stamping on balance and attachment is a rectangular terminal clip. (looks like your 770 balance with the terminal clip connection)
Which replacement balance is needed?
User submitted a photo of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thank you for posting. I agree, our Series 770 looks like a close match. Check out our S770-28, where you can find all relevant pricing. You will have to weigh your sash to determine the appropriate option to use.
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