Various suppliers half cheek jointed bits
The half cheek pieces on a this bit helps turn the horse by placing pressure on the sides of the face. The single joined eggbutt has a nutcracker effect over the lower jaw. The jp (john patterson) bits are crafted with curved mouth bars that reduce the nutcracker action of a regular snaffle, they stop the bit from hitting the roof of the horses mouth. The curved mouth also allows room for the horses tongue and eliminates interference that a conventional bit causes. The pinchless bit is unique in that the mouth piece moves independently from the outside rings. The mouthpiece moves smoothly and freely, allowing pressure from the rein to occur only on the side of the mouth that is required. A bit whatever the particular design, should be wide enough to allow about 13mm (1/2 inch) on either side of the horses mouth. Bits that are too narrow will pinch, but also bits that are too wide will tend to slide across the horses mouth.
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