Food safety problems with a corona mill

So, after all I decided to upgrade my milling process. So far I used a kitchen blender which actually worked ok, but part of the grains were not crushed enough while other parts were crushed too much. Not consistent in other words, and it also took long to mill the grains with it, because you can not just run it while continously pouring the grains in it, but run 5-6 batches for a 3 kilogramm grain bill.

First, I got a corona mill, cheapest online, and soon as I unpacked it, realised that the coating was weird. I ran it without grains to see if what I was thinking of was going to happen and of course, metal dust came out of it. Meh. I ran it with grains, but still. Then I figured that the shaving were not only coming from the plates, but the spiral and the shaft. I tried brushing the coating off with my dremel, but that didn't help. I complained and got a partial refund, but I am very suprised to see that the same kind of mill with the same or a very similar coating is sold everywhere, not only online but in brew shops too. Also read on forums that others had similar problems. This is just sooo not good.
Luckily I came across a great deal of another mill so I will think about what to do with this one later.