SWISCO - The Replacement Hardware Authority

Plastic window part replacement

A quick learner from Lansdale Pa says:
I think I am looking to replace just the plastic? This is the first time I am replacing a part such as this. I realize that the spring comes out and could be remounted back into another (whatever it is called) Could you direct me to the part I need, please, thank you!

Mark
User submitted a photo of a coil window balance.
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Tom from SWISCO responded:
Hey, Mark, good to see you again. Please see our Series 140 coil balance and see if this could work for you. You may also want to see our video on how to replace this type of balance.
A quick learner from Lansdale Pa says:
Tom,

What poundage should I choose? Does the 3R refer to lbs?

Mark
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Tom from SWISCO responded:
Yes, for this particular balance the stamp of "3R" corresponds to our S140-3. A pair of these balances working together can support a sash weight of 4 through 6.99 pounds.
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