Modular 65mm Spindle Mount for ShapeOko2

I've designed a 65mm spindle mount to fit a Shapeoko2! I'm using this mount to hold a Chinese water-cooled 65mm AC spindle.

**You can learn more about this mount by watching the videos I made about it:**

* [Demonstration of the basic features of the mounting system.](https://www.youtube.com/watch?v=iYn1QCQ3Y6U)
* [Demonstration of the dust-collection features of the mounting system.](https://www.youtube.com/watch?v=YuTOi7dQXYw)

**The mount solves the following problems:**

+ Moun