Thank you Michael for such a great cad program!

I'm just a hobbyist that did a little 2D CAD about 25 years ago as part as my work.
I'm posting (attempting to, my first post) a 3dm file.

This question is more for curiosity than anything else.
This is the first time that "Boolean Diff" didn't work for me!

I'm curious why it didn't work for me. It seems simple. Maybe I'm missing something.

I want to remove the little cubical shapes from both wheels.

Thanks for your help to satisfy my curiosity!

JoeZ