Back when I started riding back in the Dark Ages dressage riders still used single-jointed snaffles.
After my experiences with two horses I am REALLY wondering if the double jointed snaffles are really milder than the single jointed snaffles.
I think a lot of the problems with single jointed snaffles may have come from the bits being too wide for the horse’s mouth. This is one beef I have against loose ring bits, they HAVE to be a bit wider so the corners of the horse’s lips don’t get trapped where the ring goes through the mouth piece. In physics I always heard that the longer the lever the stronger the effect and I see no reason why this fact, established for thousands of years, suddenly does not matter when we put a bit in the horse’s mouth.
One book I read, “On Seats and Saddles; Bits and Bitting” by Francis Dwyer he said that he did not like double jointed snaffles at all because they could act like a twitch on the lower jaw. Now he was in the Cavalry (Austrian) and they rode with one hand so I could see that. Then I remembered that when I rode with my favorite double jointed bit, a Dr. Bristol, that the horses were MUCH happier with me if I widened my hands, sometimes so much it drove my riding teacher crazy. When I got my hands closer like my riding teacher wanted the horses all sucked back some, which ended when I widened my hands back out and they cheerfully reached for contact and kept contact. Could the rider holding their hands close together with a double jointed bit turn the bit from mild to excruciatingly painful? I don’t know, I just ride with my hands much wider than dressage riders and the horses I ride are much happier with my hands that way.
Two horses basically told me that they greatly prefer the single-jointed snaffle, and in the single jointed snaffle they do not react as badly when I bring my hands closer together.