Pivot shoes for Alside Excaliber Window

A home owner from PA says:
Need 6 pivot shoes for Alside Excaliber Window
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Tom from SWISCO responded:

Take a look at our 15-175, I think this could be a good replacement option for you. Let me know what you think!

A home owner from PA says:
RE: Alside Excaliber Window Pivot Shoes

Tom, You recommended the 15-175. There is no coil in the window. Can i use this part without coil?
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Tom from SWISCO responded:

No, if there is no coil then your windows won't stay up when you raise them. They are necessary for your window to function.

The 15-175 is compatible with the Series 152 spring. Since you don't have any old springs to use as a reference, I will need you to give me the exact weight of your sash so that we can confirm the proper Series 152 option.

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