I agree with the others who suggested going back to bitting basics, and try a plain snaffle, maybe a French link, because it is double-jointed. Just don’t get the French link confused with the Dr. Bristol snaffle! That is also a double-jointed snaffle, but is a very harsh one.
Originally posted by JPRose97:
I have a QH who can be a hot head and was quite unresponsive/hard-mouthed in a split bit (was broke out with a tom thumb and rode in it till a year after we got him when he turned six.) He’s more responsive in the curb, still a little iffy but responds a lot better.
A Tom Thumb is a “bastard” bit – neither a snaffle nor a curb. True, it has a jointed mouth, but its shanks are like those of a leverage (curb) bit, so it’s neither the one nor the other. It is a HORRIBLE bit, especially for a green horse, so no wonder a horse would be unresponsive (at best) in it – some horses can be dangerous in a Tom Thumb because it gives such muddled non-signals.
There is also a Tom Thumb Pelham, which is something totally different, and is simply a pelham with short shanks. comes with a variety of mouthpieces, including a jointed mouthpiece.
I would go to a basic French-link snaffle, either an eggbutt, or possible a full-cheek (which can help a green horse learn steering).
I would also work on getting the pony to move off my seat and legs first, and INTO the bit, for moving off, turning, and halting. That is the primary cue for a horse; the bit is just there to “fine tune” the other aids and be used in combination with the seat and legs.