Great design! I created my own approach to solving the crappy new collet that ships with the v2, but this is a much, much better solution.
Had some issues with getting the bearing out of the stock arm, and then realized I didn't have to swap it out. Have the replacement arm printed, but right now it's working flawlessly as-is, so all you really need to replace the junk new design is the base plate.
Easy print, followed the instructions and flipped the cover piece (perfect fit on that, by the way) and no problems.