1/4 and 7mmare close to the same. Did you buy a 1/4 inch plate separately? I see most Cabela's grinders come with plates in metric sizes...If I'm adding fat then I grind the fat separately. If you try to add it as you did the blend is inconsistent. I have a meat mixer that I use to blend the ground meat and fat together then. The meat mixer is not necessary and doing it by hand works just fine. I run our burger through a 1/4" plate.
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