Oh My Gosh, this was the easiest to read explanation of bits I've ever read (ok so I haven't read a lot, but mostly got to confused to continue reading). I applaud and thank you for making this thread.
Now for a question, I am using a copper barrel (Billy Allen) bit almost identical to the one you posted on my new Morgan gelding. He has not been ridden much in the past year but is very quick to re-learning. Anyway, When I first got him they had a chin strap on him (all leather) that was awfully tight, he was do a small rear and throw his head straight up when I would pull back or tried to back him. We loosened it one hole and seems to help, however, backing he just refuses to do. He still is tossing his head if I use to much pressure on him. I was thinking of switching bits (also going to have teeth done at the begining of the year as I'm not sure when they've been done). Any suggestions?
Thanks again, this was awesome.
When you give a personal lesson in meanness to a critter or to a person, don't be surprised if they learn their lesson.