How to fix a rubber necked horse. That is a horse that when you use a rein aid to turn the horse, the horse turns his neck but keeps going straight forward, or goes off in the opposite direction. What the rider does to try to get the horse to turn is to bend the neck more, then the horse is almost bent in half, and the horse still does not respond to the turning rein. This rubber necking behavior is usually from too much training flexing at the pole standing still.
How to fix this problem is the same way you would guide any horse for a turn. You would ask with your inside rein, by turning the neck in the direction you want the horse to go, and then use a neck rein to bring the shoulders around. But a rubber necked horse will cause the rider to over bend the horse because the horse is not turning.
It makes sense, but what you need to do is just turn the head only far enough to point the horse's nose in the direction you want him to go and no more. Then start using the neck rein to take the shoulders over. On this kind of a horse what will happen is that when you start with the neck rein to influence the horse's shoulders, the horse will swing his head toward the new direction and when this happens you want to not give with the inside rein so the horse can not swing his head toward the neck rein’s influence. Your focus is to keep the head right on the course you want the horse to go and add your gas pedal and he will go there.
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Have a great weekend! Be on the lookout for new horse and human sightings and may the horse be with you.