Spintend motor mount for onewheel XR frame

Spintend motor mount for onewheel XR frame 
the center can be 0.5mm off so print first and then mill 
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I used this for my DIY onewheel based on XRFrame and this motor https://spintend.com/collections/hubmotors/products/10-inch-10x6-5-5-wide-tyre-hubmotor-for-diy-one-wheel?variant=43068906111128

I suggest to make a kinda screw on top to tighten center core on place