Clearly there must be (or have been) some quality control or supplier problems with this. Deciding I wanted, on retirement, to try my hand at classic French recipes (and inspired by Tony Bourdain's "Les Halles" book) I wanted to make pates, so I needed a mincer. Not wanting to spring the money for an electric one I bought this, not least because it appeared to be a dead ringer for the Spong mincer my parents had 50 years ago.
It works. It can be a little tricky to assemble (make sure you have the four prong chopper behind the extrusion disc the right way round), everything properly seated and you need to tighten the table attachment screw quite hard (I used my kitchen steel as a lever inserted in the attachment screw handle to get a couple of extra turns). None of the troubles reported here although you do have to push the meat down into the funnel to make sure the screw drive engages it (watch your fingers!). Mincing is slow but effective (two pounds of pork pate mix took about 20 minutes) with no great effort needed to turn the handle. You need to cut the meat chunks fairly small for it to work properly (no bigger than 1" all round) but that ought to be common sense.
You DO need to clean this by hand soon after doing the mincing AND then dry and lightly oil the cutting chopper and the extrusion disk. They appear to be made of carbon steel, which is more durable and retains its edge longer than stainless but it rusts very easily (e.g. even if you dry them thoroughly the damp air of a kitchen will rust them without oil). Use cooking oil or use one of those one-cal spray things. DON'T put it in the dishwasher. My ordinary washing up tools (a brush and scrubber) did the job with no problems. This is neither difficult nor rocket science. The body of the mincer is cast iron covered with paint so if it gets chipped it may rust, it's also possible that the paint might flake in the dishwasher. None of the problems mentioned here, many of which have arisen because, I suspect, people these days have forgotten (or never knew) that you need to respect your tools and treat them properly. Tools rust if you neglect them. Hey, who knew!
I'm now considering a move up to an electric one only because I'm now mincing a lot more regularly (that Bourdain pate recipe is foolproof, produces sensational results and is infinitely variable for a wide range of meat mixtures). In addition you might want to think why supermarket mince (or butcher mince) is so cheap: it's because they put a load of stuff (some of which you definitely wouldn't want to know about) in it they couldn't sell on its own. But if I wasn't I'd be perfectly happy to carry on using this.