For many years I was riding 3 different horses, all in a JP Dr. Bristol D-ring. Even with my many hand problems (and balance and proprioception problems) this was the bit that 3 horses decided was the best bit for my hands. I was basically doing equine physical therapy (old weak horses) and out of all the bits I tried this was the ONE that suited my hands the best.
All three horses reached readily for the bit in response to my leg aids, and they kept good contact without any fussing while we walked and trotted around the riding ring.
There are 4 ways one can put the Dr. Bristol on the bridle, and only one way is the correct way if you want a comfortable horse. The other 3 ways can range to minor irritation to a full scale “cussing out” as the horse tells the rider no how, no way.
The gentle way for the Dr. Bristol is to make sure that the cannons’ curve faces upward, then the center plate has to slope UPWARD toward the horse’s nose. Then the plate lies flat on the horse’s tongue, the horse is very comfortable, and the horse has full freedom to play with the bit with truly subtle movements of the horse’s tongue, lip, lower, jaw, poll and upper neck.
This is way too subtle for a bit check in a busy environment. It is a subtle difference looking into the horse’s mouth. I do not think that too many volunteers would willingly put their fingers deep enough in the horse’s mouth to check the angle of the center plate.
To me, with my hands, the Dr. Bristol is the best snaffle to get results that get near the responses a rider can get from a relaxed horse in a double bridle. No other snaffle that I have ridden with comes close with less subtle finger to mouth communication.