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Paul from SWISCO responded:
September 14, 2017
The nylon parts (15-181 and 15-182) that hold the Series 190 coil springs in your window look fine. You should only need to replace the coils. To select the proper Series 190 coil, you will need to read off the spring weight numbers that are located near the end of the coil, where it screws onto the 15-180 pivot shoe.
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