Do not wash in the dishwasher and tumble dry. Washed and immediately wipe dry, otherwise - rust. I was able to eliminate the black cinder: I wiped the hole with a black coating on the body with a rag, then dried it again, then smeared it with sunflower oil, now there are no problems. In general, everything turns well: tomatoes, onions, and any meat, the veins are sometimes wound, but this does not interfere with twisting 5-10 kg of meat.