Head carriage is not on the bit. This is a common misconception that comes about due to its name. Head carriage is the final symptom when all other parts are working correctly. The horse needs to be working up from behind, not dragging itself around with a hollow back and its head tucked in. This is why I really dislike most training aids. The vast majority of people use them incorrectly.
Just try a bunch of different things I ended up finding out that if you wiggle the bit side to side in my guys mouth he'll drop his head into the contact
Typically with thoroughbreds you don't really need them as they're already taught to get on the bit, my guy was really easy to develop a headset on
Yeah they are meant to be a training add to help the horses development with the muscles she’ll need went I ask her into contact and frame work but when used to often the training add becomes a band-Aid. I am currently only using it twice a week and We work almost everyday. Until she had Developed The muscles she needs. Thanks you for answering me! I can’t agree more!
Neck stretchers, and other similar training aids, encourage the horse into a false outline. People start to believe their horse is "on the bit", and are less likely to actually develop their horse's way of going. I would avoid if possible.