No! I just notched it there so the rotor hat would fit better. I drilled through the Aluminum hat into the steel hub and then inserted 4 1/2-20 screws.
Because the Mule has front and rear brakes I needed to run two master cylinders, One for the front calipers and one for the rear. With the device I built today I will be able to adjust the front and rear Bias,
Here is a picture of my mini mule in Rocket Transport Mode. So far the Mule has been to the desert twice and performed flawlessly !!! So happy with the build.