Coil spring replacement

A quick learner from Durham, NC says:
Window (3 x 3 ft) won't not stay up.
Need to replace the coiled spring.
Please suggest which model to order.
User submitted a photo of a coil window balance.
Profile picture of Paul
Paul from SWISCO responded:
First, see our video on coil spring balances below. Now, as for the hardware itself, the pivot shoe looks like our 15-199. If you agree, then I also recommend our Series 160 coil spring.
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