Clearly mark has never worked in a butchers shop or any other similar environment,
Training would go something like, "ok here's the meat, stuff it in there, switch it on here,and put the paper to wrap it under here where the mince comes out, right now mrs smith wants a kilo, and she can't wait all day".
I worked in a butchers shop many years ago, after school and at weekends, and frankly i am struggling to see how he did it, unless he was simply pushing the meat down the hole with his hand, and not using the wooden stick to push it in.
Either that or he was ogling the customer with the big tits and not watching the mincer. I lost the end of a thumb on a cooked mat slicer doing exactly that, but they were great tits, i have to say.