I was actually being sarcastic about the nerve endings....if a horse has been numbed in a snaffle, why would you reschool him in a snaffle? Why not choose a bit that works in different areas of his mouth?
Why wouldn't you reschool him to be responsive to the snaffle again?
Again, you are missing the point. The control doesn't come from the bit. It comes from theleg, seat and weight aids and drives it into the bit to direct the energy.
Your stops? They come from seat and leg.
Your turns? They come from seat and leg.
The bit is there to help communicate these things. If the horse does not respond through seat and leg, you lift up on a rein and drop it the second the horse responds. You do not typically drive, steer or stop with the bit.
The orders come through your seat, leg, and rein LAST.
You do not control a car with only the steering wheel. You have the ignition, the gears, the gear shift, the power steering, the excellerator and the break. You have timing and perspective. Anyone who controls a car through the steering wheel only is going to crash. Period. You don't change out steering wheels. You go back to Driver's Ed to better your driving.
Being unresponsive to a snaffle means the horse isn't reacting properly to the aids, or the aids aren't being used properly, if the aids are even used at all.