Some notes on the Kitchen Aid attachment.
Sorry my pictures are a little blurry - but I think it shows it well enough.
Don't OVER tighten it with the wrench - tighten it just a bit, I guess. I had a crack and it got worse when I tightened it - trying to go really tight. Maybe that's how I cracked it in the first place. Here's the crack:

OK, I ground all kinds of meat yesterday, here's some pics of the results on the beef (ground chuck):
This is how I prepared it - I also got it super chilly in the freezer, around 20 minutes.

Here's how it looks hanging from the grinder. My results were better this time, but still not as nice as the Hobart at work.

Here's the ground beef sitting in a bowl:

It's not really that bad. I think that either the chill, or the tighter fasten might have helped. It's been stringier in the past, but this still is a tad stringy.
However, it cooked up and ate beautifully. Nice to chew. I only ground once - we always grind twice at work, because the final product just LOOKS so much better. But I was afraid of making mush, and think my results were good.
So maybe I'm being nitpicky about the grind. But I'm glad I found this thread, I hadn't been chilling or using my wrench in the past, and I learned something.
Nancy