Well, I have the tub grinder up and running really well. After some false starts and a lot of modification, the end result is great. With a 16"x42" hammer mill with 64 hammers, it is like a tornado when I dump into the tub so I had to build a shield over the back half and change the feed system in the tub. Twice I have heard a loud bang and found two horse shoes destroyed about a 100' from the machine, I always load from the safe side

however, I did get a fat lip from a chunk of something. I have to be careful when I dump, the bucket angle can cause a ricochet affect towards me. I also can only grind on days we get a south or south west wind. Due to yard logistics, fence, trees, fire wood, log decks and poop piles everywhere I can't grind any other direction.
So, if you need fertilizer I am the go to guy

Here are some before and after pic's: