I recently made a few more 8mm cutter grinder wheel arbors to fit my Quorn cutter grinder. I use the 8mm arbor for it's ease of use and quick change over from one type of wheel to another. Once the wheels are dressed true they can be taken out of the spindle and put back in and will continue to run perfectly true with no need to redress. This is a real convenience and time saver. I turned all the arbors in one chucking including threading before removing them from the mini lathe. I have enough QC lathe tool holders setup for this job so it goes quickly. I also have enough wheels and arbors to leave all my grinding wheels and arbors mounted at all times for quick change over.