slots in shoes

A home owner from Livonia, MI says:
Why are there three slots in the top of the shoe in my window frame?
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Jasmine from SWISCO responded:

Thanks for writing! There are could be a few different factors contributing to the design of your shoe. For example, it could the way they interact with your balances or maybe just a manufacturer choice a design.

Are you looking to determine if our 15-015 is the right replacement for your existing pivot shoe? If so, I'll need to see a photo of it removed from the window. It would also help to see a photo of the compatible balance it is used with.

Please let me know if you have any questions in the meantime.

How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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How to Remove a Pivot Shoe (Cutout Method)
How to Remove a Pivot Shoe (Cutout Method)
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How to remove window pivot shoes
How to remove window pivot shoes
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Anatomy of a tilt window
Anatomy of a tilt window
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