Hello, I recently purchased an AR8 ProPlus in October 2017. I love the machine. It is well built and has withstood a few of my oops occassions! One issue I did have was that the black adapter ring for the dust boot was missing and not included in the package. The spindle diameter is 3.125" and the dust boot hole is 3.5"..........the acrylic dust shoe plate should not be flexed that much without the use of some kind of spacer to take up some of the space. I think this is the reason why I have read several complaints from users about the acrylic dust shoe breaking at the bolted joint. So as an interim solution, here is a quick design for an adapter ring that can be turned on a lathe or other means. I have not had any issues with the dust boot since I installed the temporary adapter ring.