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here is some screen caps from fusion 360 the gray is the top axle cover and the yellow the center section
you can see the odd shape of the top cover doesn't fit the center section profile and if i zoom on the bearing carriers for the counter gear you can see it oddly has 2 centers one higher one lower which might explain the backlash issue on the counter gear and the skipping issue that is now occurring

https://i.imgur.com/1h9iE6R.jpg

https://i.imgur.com/w1RNT7B.jpg
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