The earlier picture of the missing flesh is really unnecessary, and makes me feel queasy--JohnR
I appreciated the educational impact. Not pleasant to view.
I wish I could help, just wanted to share: There are several companies which should kick their application designers in the teeth. I've had to get up and walk around many times in the past couple weeks.
Found these two tooling around the "Venison Care" article. Interesting...
http://www.fieldandstream.com/blogs/the-wild-chef/how-to-dry-age-a-venison-steak-in-your-fridge...
Per the topic; jig is the most logical choice. Per Svnmag; #13 black/chrome CountDown with good supply of different sized rings/trebles. A jig in itself.