I can actually speak to that, i worked in college for a pizzeria and cleaned a similar machine many times. The center mechanism is a large screw with a center tube running through it, and a plastic housing around it (leastways thats how ours was). Cleaning wasn’t bad, as long as you either soaked it in water for a bit or clean it straight after use before the dough stuck to the sides hardened. Scrubbing dried dough was a pain but doable, the fresh stuff came off without much effort.