The critical reviews are correct! The plastic grinder works ok not great.  It grinds meat well once it gets into the worm screw area.  I tried stuffing sausage, what a glorious waste of time.  The ground meat doesn't feed into the worm area,  The ground meat just extrudes out around the plastic plunger provided with the grinder.  I wonder if any of the design team actually tried to use this thing.  It gives mechanical engineers a bad name.