Got this knowing I could probably mod it to take 8mm round bar. (max stated is 5mm)Need to make some round grills for a few BBQ's I've fabricated.Not too difficult to get 8mm through it, but it's definitely maxed out at that.Just remove the idler, and use it's shaft as the guide but only make 1/4 turn adjustments until you achieve the radius you want or you'll stress the machine too much.Good idea to pull it down before using and grease everything. It comes covered with a very light oil/grease but this is for corrosion. All the critical stuff inside was pretty dry on mine.The grease nipples are for show only, or at least they are on my sample. The shafts aren't cross drilled. Just grease it all by hand, especially the gear cogs and it should last a while.