Help me identify and replace this Pivot Shoe!

A handy person from Wyoming says:
August 9, 2019
Hey guys. I can't seem to remove this spring window brake from the window frame, there is no cut out. Am I missing something to do with how to remove it? And idea what part it is for replacement?
I just ordered new balance springs from you all for this window (28E) as I thought this was the problem. Clearly isn't not the whole problem as this brake will not, well, brake.
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Bob from SWISCO responded:
August 13, 2019

Thanks for writing in! This pivot shoe might be our 15-129; Just compare the dimensions once you remove the pivot shoe from the window. And speaking of that, see the video below, which details what you need to do to make your own cutout. Let me know what you think.
A handy person from Wyoming says:
August 18, 2019
You guys are amazing. Every company needs to be like you guys A+++
I wish I could buy my whole next house from you guys, it would make being a homeowner a MILLION times easier.
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Bob from SWISCO responded:
August 19, 2019

Wow, thanks for the really kind words! We love to help our customers in any we can, and are more than happy to assist in making the job of being a homeowner all the easier. Let us know if you ever need anything else, and thanks much for considering our business! 
Pivot Shoe, 9/16" Thick
Pivot Shoe, 9/16" Thick
15-129
$2.50
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
VIDEO
WATCH >
How to Remove a Pivot Shoe (Cutout Method)
How to Remove a Pivot Shoe (Cutout Method)
VIDEO
WATCH >
How to remove window pivot shoes
How to remove window pivot shoes
VIDEO
WATCH >
Anatomy of a tilt window
Anatomy of a tilt window
VIDEO
WATCH >
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