Pivot shoe size

A quick learner from NJ says:
I measured the channel depth to be 9/16. I assume 15-118 is the right size. I want know if I should buy one size smaller, perhaps 15-015
User submitted a photo of a pivot shoe.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. I recommend removing the shoe from the window and measuring it directly, rather than the channel itself. That will let you know exactly what shoe you need. Keep in mind the most important measurements are the width and thickness.
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