I had metabo, makita grinders available to use. The makita seemed the best option to mount the housing, but the thread for the spindle was drastically smaller (M10 x 1.25 I think). The roller that is in this kit has a thread that was I think 5/8-11 If memory serves. I used a lathe to make a quick adapter to mate between the two sizes. Alternatively, if you have a grinder with the correct thread, the kit comes with lots of spacers to change the diameter that connects to the grinder. all but one of the spacers were material that was a bit spongy and seemed problematic. Otherwise, the kit is very heavy, seems well made, and ran true. I worried because so many reviews say it wasn't true. I would bet that was operator error trying to use those spongy spacers to hold everything aligned. Don't worry about ordering it if you have a bit of mechanical sense.
Chuck 
